What Does Cocaine Do to Your Memory

Memory is not a single thing. It is the way we hold on to what has just happened, learn new skills, recognise the people we know, follow instructions, and find our way through an ordinary day. When memory works well, we hardly notice it. We remember where we put our keys, what a friend told us yesterday, and what we were supposed to do this afternoon, without having to think hard about it. When memory starts to fail, daily life becomes harder in a hundred small ways. We repeat questions, miss appointments, lose track of conversations, and feel embarrassed in front of people we care about. Cocaine can damage memory in exactly those ways, and the damage is often noticed by other people before the person using the drug notices it themselves.

This article explains, in plain words, what cocaine does to memory. It starts with how memory normally works, then looks at what happens in the brain when cocaine is used, and how that affects short-term memory, learning, remembering names and faces, following instructions, and recalling the past. It also looks at how memory problems show up at work, at school and at home, and how focus, sleep and stress are tied into the same picture. It is general information only, not individual medical advice. If you are worried about your memory, or about someone else’s memory, a qualified health professional is the right person to talk to.

How Memory Normally Works

To understand how cocaine harms memory, it helps to understand how memory works in the first place. Memory is usually described in three stages: taking information in, storing it, and bringing it back when we need it. When you hear a new name, read a set of instructions, or watch someone show you how to do something, your brain first pays attention to it and holds it for a short time. That is short-term memory, sometimes called working memory. It is like a small desk where you keep the things you are working on right now. If the information is important, your brain then stores it for longer, in long-term memory, so you can bring it back days, weeks or years later.

Different parts of the brain handle different kinds of memory. A part called the hippocampus plays a central role in forming new memories, especially memories of events and facts, such as what happened yesterday or what you learned in a lesson. Another part, the prefrontal cortex, at the front of the brain, helps with working memory and with planning, organising and following through on tasks. These parts of the brain need a steady supply of oxygen and nutrients, carried by the blood, and they need a balanced supply of brain chemicals to work properly. When that balance is disturbed, memory suffers, sometimes in obvious ways and sometimes in ways that are easy to miss at first.

Memory also depends on attention, sleep and mood. We remember things best when we are paying attention, when we are calm enough to take information in, and when we have slept well enough for the brain to store what it has learned. Sleep is especially important, because during sleep the brain sorts and strengthens the memories of the day. If attention is scattered, if mood is low or anxious, or if sleep is poor, memory will be weaker, even in a healthy brain. Cocaine affects all of these things at once, which is why its effect on memory can be so wide-ranging.

What Cocaine Does to the Brain in the Short Term

Cocaine is a stimulant, and it acts on the brain quickly. One of its main effects is to increase the amount of dopamine in the spaces between brain cells. Dopamine is part of the brain’s reward system, and it helps us feel pleasure and motivation. Cocaine floods that system, which is why it can bring a short feeling of energy, confidence and excitement. But the same flood disturbs the balance of other brain chemicals that are involved in attention and memory, and it puts the brain into a state of high alert that is not good for taking in new information.

When the brain is overstimulated, it finds it hard to focus on one thing at a time. Attention jumps from one thought to another, and details slip past without being properly stored. A person may be in a conversation and realise, halfway through, that they have not heard what the other person just said. They may read a page and reach the bottom without remembering any of it. They may be given a simple set of instructions and forget the second step before they have finished the first. This is not because they are not trying. It is because the brain is too wired to hold information still long enough to store it.

Blood flow is another part of the picture. Cocaine narrows blood vessels, which reduces the amount of oxygen reaching the brain. The brain needs a rich, steady blood supply to work well, and even a temporary reduction can affect thinking and memory. Over time, with repeated use, the blood vessels can become damaged, and the brain may receive less oxygen on a regular basis, not just while the drug is active. That long-term reduction in blood flow is one of the reasons that memory problems can persist even when a person is not currently under the influence of the drug, and why they can get worse the longer use continues.

Short-Term Memory and Forgetting Recent Things

Short-term memory is often the first kind of memory to suffer, because it is the most fragile. It holds information for seconds or minutes: a phone number you have just been told, a shopping list, the name of someone you have just met, or what you came into a room to do. When short-term memory is weakened, these small pieces of information vanish almost as soon as they arrive. A person may ask the same question twice in a few minutes, not because they are rude, but because they genuinely do not remember asking it the first time. They may walk into a room and stand there, unable to remember why they went in. They may lose track of a conversation halfway through and have to ask the other person to repeat themselves.

These lapses are embarrassing, and they can be confusing for the people around the person. A partner may feel ignored when their words are forgotten. A friend may feel hurt when a story they told yesterday is met with a blank look. A colleague may feel frustrated when an agreement made in the morning is forgotten by the afternoon. The person themselves may feel confused and defensive, because from inside, the forgetting does not feel like forgetting. It feels like the information was never there in the first place. They may insist that nobody told them, when in fact they were told and simply did not store it. That gap between what happened and what they remember can lead to arguments that neither side understands.

Over time, repeated short-term memory failures can make a person lose confidence in their own mind. They may start to avoid situations where they need to remember things, such as social gatherings, meetings, or new tasks at work. They may rely heavily on notes, lists and reminders, and still find that they forget to look at the notes. They may double-book appointments, miss birthdays, or forget to pay a bill, and each mistake adds stress, which makes memory worse again. It is a cycle that can make ordinary life feel unreliable, and it is one of the most common ways that cocaine’s effect on memory shows up in daily life.

Learning New Things Gets Harder

Learning depends on memory, so when memory is weakened, learning becomes harder too. A student who uses cocaine may find that they can sit through a lesson and still not remember what was taught. They may read the same page three times and still not be able to explain it. They may practise a new skill and find that the next day, they have to start again from the beginning, as if the practice had never happened. This is not because they are not intelligent. It is because the brain is not storing what it is being taught, so the learning does not stick.

The problem is worse because learning also needs attention, patience and sleep, and cocaine disturbs all three. Attention is scattered while the drug is active, and in the crash afterwards the person may feel too tired and flat to concentrate at all. Sleep, which is when the brain strengthens new learning, is often poor, so even the learning that does happen during the day may not be properly stored overnight. A person may work hard at learning something new and still make very little progress, which is deeply frustrating, and that frustration can make them give up on learning altogether, which then limits their chances at school, at work, and in life.

For adults, the same problem shows up in different ways. Learning a new job, a new route, a new computer system, or a new set of rules at work all require the brain to take in and store new information. When that process is weakened, the person may take much longer to learn than their colleagues, make more mistakes, and need instructions repeated many times. Managers may interpret this as laziness or lack of ability, when in fact it is a memory problem caused by the drug. The person may feel ashamed of needing so much help, and they may try to hide the problem, which only makes it worse, because hiding a memory problem means not asking for the support that could help.

Remembering Names, Faces and Conversations

Remembering people is one of the most socially important kinds of memory, and it is also one of the most sensitive to cocaine’s effects. Names are especially hard, because a name is a small piece of information with no obvious meaning attached to it, and it needs to be stored quickly when we meet someone new. A person whose memory is weakened may meet someone, hear their name, and forget it within minutes. They may meet the same person again a week later and have no memory of the meeting at all. That can feel rude to the other person, who remembers the meeting clearly, and it can make the person using cocaine feel embarrassed and anxious about meeting new people.

Faces can be affected too. We recognise faces using a different part of the memory system from the one we use for names, but both can be weakened when the brain is not storing information properly. A person may see someone they have met before and feel a vague sense of familiarity without being able to place them: they know the face, but they cannot remember where they met, what the person’s name is, or what they talked about. That feeling of almost remembering is frustrating, and it can make social situations stressful, because the person is always worried about being caught out for not remembering someone they should know.

Conversations suffer in a similar way. A conversation is not just a single fact to remember. It is a flow of information, with each part building on the one before. If a person forgets what was said a few minutes earlier, they lose the thread of the conversation, and they may repeat themselves, ask questions that have already been answered, or change the subject without realising it. The other person may feel that they are not being listened to, and they may stop sharing things, which makes the relationship feel thinner. Over time, the person may start to avoid long conversations altogether, because they know they will lose track, and that avoidance makes them lonelier, which is bad for both memory and mood.

Following Instructions and Everyday Tasks

Everyday life is full of instructions: a recipe, a set of directions, a list of tasks at work, a doctor’s advice, or a simple request from a family member. Following instructions requires holding several steps in mind at once, in the right order, and remembering what has already been done. When working memory is weakened, that becomes difficult. A person may start a task, forget what the next step is, and have to go back and ask again. They may follow the first two steps of a recipe and then forget whether they have added an ingredient. They may drive to a familiar place and suddenly not remember which turn to take. These are not dramatic failures, but they add up, and they make daily life feel unreliable.

At work, the problem can be more serious. Many jobs require a person to follow a sequence of steps in the right order, to remember safety procedures, or to keep track of several tasks at once. A person who forgets instructions may make mistakes that cost time, money, or even safety. A cook who forgets a step in a recipe wastes food. A driver who forgets a route wastes time and fuel. A worker who forgets a safety step can put themselves and others at risk. Employers may not know the cause, but they will notice the mistakes, and the person may lose their job, which then adds stress and makes memory worse again.

At home, the same problem shows up in small, everyday ways. A parent may forget to pick up a child from school, or forget that they promised to help with homework. A partner may forget to do a chore they agreed to, or forget that they already told someone something. These lapses are often interpreted as carelessness or selfishness, when in fact they are memory failures. That misunderstanding can cause arguments that are hard to resolve, because the person who forgot genuinely believes they were not told, and the person who told them genuinely believes they were. Without an understanding of how memory works, both sides can end up feeling hurt and angry, when the real cause is the drug’s effect on the brain.

Old Memories and the Past Feeling Distant

Most of the memory problems linked with cocaine involve new memories, the things that have happened recently. But over time, older memories can also feel more distant and harder to reach. A person may struggle to remember details of events from months or years ago that they used to recall easily: a holiday, a family celebration, a time at school, or a conversation with a friend who has since moved away. The memories are not necessarily gone, but they feel further away, as if they are behind a fog, and the person has to work harder to bring them back.

This happens partly because the brain stores memories in networks, and when new memories are not being stored properly, the older networks are not being refreshed and strengthened by new connections. It also happens because the brain’s overall health is affected by reduced blood flow and by the chemical imbalance caused by repeated use. The hippocampus, the part of the brain that helps form and retrieve memories, is sensitive to these changes, and when it is not working well, both new and old memories can suffer. The person may feel that their past is slipping away from them, which is a frightening and sad experience, because our memories are part of who we are.

There is another, more human reason why the past can feel distant. When a person’s life has become chaotic, with broken sleep, strained relationships and missed events, there are fewer clear, happy memories being made, and the old ones start to feel as if they belong to a different life. A person may look back at a time before they started using cocaine and feel that the person they were then is a stranger. That sense of distance from their own past can add to low mood and to a feeling of loss, and it can make it harder to believe that life can get better, because the good times feel so far away.

Focus, Attention and Memory Together

Memory and attention are so closely linked that it is hard to talk about one without the other. We can only remember what we have paid attention to, and if attention is scattered, memory will be weak. Cocaine disturbs attention in two ways. While the drug is active, attention is overstimulated and jumpy, so the person finds it hard to stay with one thought or one task for long. They may start one thing, get distracted by another, and then forget what they were doing in the first place. After the drug wears off, attention can swing the other way: the person may feel foggy, slow and unable to concentrate at all, as if their mind is working through thick mud.

This foggy feeling is often described as brain fog, and it is one of the most common complaints from people who use cocaine regularly. They describe feeling as if their thinking is slower, their thoughts are harder to hold on to, and simple tasks take more effort than they used to. They may read a paragraph and have to read it again, or listen to someone speaking and realise they have lost the thread. Brain fog is not a medical diagnosis on its own, but it is a real experience, and it reflects the brain struggling to work with a disturbed chemical balance, poor sleep, and reduced blood flow, all at the same time.

The link between attention and memory also explains why memory problems can seem worse on some days than others. On a day when the person has slept badly, feels anxious, or is coming down from the drug, attention will be at its worst, and memory will suffer most. On a better day, when they have rested and eaten, memory may feel a little sharper. That variation can be confusing, because it makes the problem seem inconsistent, and the person may think they are imagining it, or that other people are exaggerating. In fact, the variation is normal. Memory is not a fixed ability. It changes with sleep, mood, stress and the state of the brain, and cocaine makes all of those things more unstable.

How Memory Problems Show Up at Work, School and Home

At school, memory problems can be the difference between passing and failing. A student needs to remember what was taught in class, what homework was set, when an exam is, and what they have already studied. If they forget homework, miss deadlines, or cannot remember what they learned the day before an exam, their grades will suffer, even if they are capable and hardworking. Teachers may think the student is not trying, when in fact they are trying hard and the information is simply not sticking. That misunderstanding can lead to the student being labelled as lazy or uninterested, which damages their confidence and makes them less likely to ask for help.

At work, the consequences can be just as serious. An employee who forgets appointments, misses deadlines, repeats mistakes, or needs instructions repeated many times will be noticed, and not in a good way. Colleagues may lose trust in them, managers may give them simpler tasks, or they may lose their job altogether. Losing a job is damaging in itself, but it also removes the routine and structure that help memory. A person without a daily routine, without regular sleep and regular tasks, often finds their memory gets worse, not better, because the brain needs regular use and regular rest to stay sharp.

At home, memory problems are often felt most keenly, because home is where we are supposed to feel safe and understood. A parent who forgets a child’s school event, a partner who forgets an anniversary, or a family member who forgets a promise can cause real hurt, even when the forgetting is not deliberate. The person who forgot may feel ashamed, and the person who was forgotten may feel unloved. Over time, these small hurts can build into a sense that the family is falling apart, and that sense can be hard to repair, even after the memory problem itself improves. That is why it is so important for families to understand that forgetting can be a drug effect, not a sign of not caring, and why professional support can help both the person and their family.

Sleep, Stress and Memory

Sleep is one of the most important factors in memory, and cocaine disturbs sleep in a serious way. During sleep, especially deep sleep, the brain sorts the memories of the day, strengthens the important ones, and clears away the unimportant ones. If sleep is short, broken, or missing altogether, that sorting process does not happen properly, and memories remain weak and fragile. A person who uses cocaine late in the day may find they cannot sleep at all that night, or that they sleep lightly and wake up many times. The next day, they will find it harder to remember things, even simple things, because the brain did not get the chance to store them properly.

Stress also affects memory, and cocaine use can increase stress in several ways. The drug itself puts the body into a state of high alert, which feels like stress. The crash afterwards brings anxiety and low mood, which are also stressful. And the practical problems caused by memory failures, missed appointments, arguments, lost work, add more stress on top. Stress affects the hippocampus, the part of the brain that forms new memories, and when stress is high for a long time, the hippocampus can become less effective. That is why a person who is stressed often finds their memory is worse, and why reducing stress, through rest, routine and support, can help memory improve.

Eating properly matters too, although it is often overlooked. The brain needs energy and nutrients to work well, and cocaine can suppress appetite, so a person may eat very little for a day or two. When the body is short of energy, the brain is one of the first organs to suffer, because it uses a large amount of energy even when we are resting. A person who is hungry, tired and stressed will find it much harder to remember things than a person who is rested, fed and calm. That is why the basics, sleep, food, water, fresh air and a regular routine, are not trivial. They are the foundation on which memory depends, and cocaine undermines all of them at once.

My Take:

I think memory is one of the most frightening things to lose, because it is so closely tied to who we are. We are, in a real sense, the sum of what we remember: the people we love, the things we have learned, the places we have been, the promises we have made. When memory starts to fail, it is not just a practical problem. It is a threat to our sense of self. I think that is why the memory effects of cocaine deserve to be talked about more seriously than they usually are. People talk about the heart and the lungs, and those matter, but losing your memory is losing a part of yourself, and that is a loss that is hard to put into words.

What worries me most is how ordinary the early signs look. Forgetting a name, losing your keys, walking into a room and forgetting why, repeating a question: these are things that happen to everyone from time to time, and it is easy to laugh them off. But when they start happening every day, when they start happening to the same person, in the same pattern, they stop being ordinary. They become a sign that something is wrong with the brain’s ability to store and retrieve information. I think it is important to say that clearly, because the early signs are the ones that are easiest to ignore, and ignoring them means the problem gets worse before anyone takes it seriously.

I also think about the shame that comes with forgetting, because shame makes everything harder. A person who forgets a friend’s name feels embarrassed. A person who forgets an appointment feels guilty. A person who forgets what their partner told them yesterday feels afraid that their partner will think they do not care. That shame can make the person withdraw, avoid social situations, and stop asking for help, because asking for help means admitting that they cannot remember. I think that is a tragedy, because the shame is misplaced. Forgetting because of a drug effect is not a moral failure. It is a health problem, and health problems deserve help, not shame.

Learning is the part that makes me think about young people, because learning is how young people build their future. A student who cannot remember what they were taught is not just having a bad day. They are losing the chance to pass exams, to learn a trade, to get a job, to build a life. I think about a young person who is bright and capable, but whose memory has been weakened by cocaine, and who is slowly falling behind their classmates, not because they are not intelligent, but because their brain cannot hold on to what it is being taught. That is a waste of a life, and it is a waste that could have been avoided if the person had understood, before they started, what the drug would do to their ability to learn.

Names and faces are the part that makes me think about loneliness, because forgetting people pushes you away from them. We build relationships by remembering: remembering what someone told us, remembering their birthday, remembering that they like a certain food, remembering that they were sad last week and asking how they are now. When we forget those things, the other person feels unimportant, even if that is not what we intended. Over time, people stop sharing things with us, because they know we will forget, and we stop being invited to things, because people assume we will not remember. That is how a person can end up lonely, not because nobody cares, but because memory failure has slowly cut the threads that hold relationships together.

Following instructions is the part that makes me think about work, because work is where memory failure has the most visible consequences. I think about a person who is good at their job, who has done it for years, and who suddenly finds they cannot follow a set of instructions they used to know by heart. They need things repeated, they make mistakes they never used to make, and they feel their colleagues watching them. That is humiliating, and it is frightening, because work is not just about money. It is about dignity, about being useful, about being trusted. Losing that trust because of a memory problem is a heavy blow, and it can make a person feel as if they are no longer good for anything, which is not true, but it feels true when you are living through it.

Old memories are the part that makes me feel saddest, because they are the ones that connect us to our past. I think about a person who can no longer remember a holiday clearly, or a family celebration, or a time when life felt simpler and happier. Those memories are precious, and losing them feels like losing a part of your life. I know that not every memory is lost forever, and that some memories can come back when the brain recovers, but the fear of losing them is real, and it is a fear that many people who use cocaine live with quietly, without telling anyone. I think we should talk about that fear more openly, because it is a powerful reason to stop, and it is a reason that comes from love: love for the life you have lived, and for the people who were part of it.

Focus and attention are the part I would explain to anyone who says they do not have a memory problem, only a concentration problem, because the two are the same problem seen from different sides. You cannot remember what you did not pay attention to, and you cannot pay attention when your brain is either overstimulated or foggy. I think it is important to understand that, because it means that trying harder to remember is not the answer. The answer is to give the brain what it needs to work properly: rest, food, calm, and time away from the drug. Telling someone to simply concentrate harder is like telling someone with a broken leg to simply walk faster. It does not help, and it makes them feel worse for failing at something that is not their fault.

Sleep is the part I would point to first if someone asked me where recovery begins, because sleep is when the brain does its most important memory work. I know that sounds too simple, and I know that a person who is struggling with cocaine will not fix their memory by sleeping one good night. But I also know that without sleep, nothing else will work properly. A brain that has not slept cannot store memories, cannot focus, and cannot think clearly, no matter how hard the person tries. If I could give one piece of advice to someone who wants their memory back, it would be to take sleep seriously, to build a regular routine around it, and to ask for help if sleep itself has become a problem. It is not a cure on its own, but it is the foundation on which everything else is built.

I want to say something about the people around the person, because they are often the ones who notice the memory problem first, and they are often the ones who do not know what to do about it. A partner who has to repeat everything three times, a parent who has to remind their adult child about every appointment, a friend who has to explain the same story again and again: these people are carrying a heavy load, and they often feel frustrated, tired and unappreciated. I think they deserve to be acknowledged, and I think they deserve support too. They are not just witnesses to the problem. They are part of the solution, because their patience, their reminders, and their willingness to stay in touch can make a real difference to a person whose memory is failing.

Hope is the part I want to end on, and I want to be honest about it. Memory can improve after a person stops using cocaine, but it does not improve overnight, and it does not improve for everyone in the same way. The brain needs time to recover its chemical balance, to repair its blood vessels, and to rebuild the networks that store memories. That takes weeks and months, not days, and the first weeks can feel frustrating, because the person may still be forgetting things while they are trying hard to get better. But over time, many people do find that their memory sharpens: they remember names more easily, they follow instructions more reliably, they lose track of conversations less often, and they feel more confident in their own mind. That recovery is not guaranteed, and it is not a reason to delay getting help, but it is a real reason to believe that change is possible.

If you are reading this because you are worried about your own memory, I would ask you to be honest with yourself about the pattern. Are you forgetting things more often than you used to? Are other people noticing it before you do? Are you relying on notes and reminders more than you used to, and still forgetting? If the answer is yes, that is not a reason to panic, but it is a reason to talk to a qualified health professional. Memory problems have many causes, and only a professional can work out what is happening in your case. What I can say is that if cocaine is part of the picture, stopping it is one of the most important steps you can take to protect your memory, and the sooner you take it, the better your chances of recovery.

If you are reading this because you are worried about someone else, I would ask you to be patient, and to be specific. Instead of saying that the person is forgetful, which can sound like an accusation, try saying what you have noticed: that they asked the same question twice, that they forgot an appointment, that they could not remember a conversation from yesterday. Specific examples are easier to hear than general criticism, and they are harder to deny. Encourage the person to talk to a health professional, and offer to go with them if that would help. You cannot fix their memory for them, but you can help them get the support they need, and you can keep the relationship open while they do.

Finally, I would say this to anyone who has never used cocaine and is thinking about trying it: your memory is one of the most valuable things you have, and it is far easier to damage than to repair. The short feeling of energy and confidence that cocaine offers is not worth the risk of losing your ability to remember the people you love, the things you have learned, and the life you have lived. There are better ways to feel good, to relax, and to enjoy time with other people, and none of them come with the risk of forgetting who you are. Walk away from the first offer, and you will never have to learn, from experience, what it feels like to lose your own memories.

One more thing I want to add is about the small, practical steps that can help while a person is working towards recovery, because grand plans are not always useful when memory itself is struggling. Writing things down, keeping a simple daily routine, putting keys and important items in the same place every time, and setting reminders for appointments are not signs of failure. They are sensible ways of supporting a brain that is still healing, and they can reduce the daily stress of forgetting. A regular time for sleeping, eating and walking can also help, because the brain stores memories better when life has a steady rhythm. These steps will not fix the damage on their own, and they are no substitute for professional help, but they can make ordinary days feel more manageable while recovery takes its course.

Frequently Asked Questions

How does Cocaine affect memory?

Cocaine disturbs the brain chemicals involved in attention and memory, and it narrows blood vessels, reducing the oxygen reaching the brain. That makes it harder to take in new information, store it, and bring it back later. Short-term memory is often affected first, so a person may forget recent conversations, names and instructions, while learning new things and following multi-step tasks also become harder.

How soon can Cocaine start harming memory?

Memory can be affected within minutes of use, because attention becomes scattered while the drug is active and details slip past without being stored. Some people notice forgotten conversations, repeated questions and missed appointments after only a few uses, especially when sleep is poor. Longer-term harm, such as persistent difficulty learning new things and recalling recent events, tends to build over weeks and months of repeated use.

Can the harm Cocaine does to memory be reversed?

Memory often improves after a person stops using cocaine, because the brain can gradually recover its chemical balance and blood flow, but recovery takes time and it is not the same for everyone. Short-term memory and concentration often improve first, over weeks, while deeper problems with learning and recall may take months to ease. A qualified health professional can assess an individual situation, which is the only safe way to get a personal answer, and some changes may not fully reverse.

Who notices the harm of Cocaine on memory first?

Family members and close friends often notice the harm first, because they see the repeated questions, forgotten conversations, missed appointments and lost details in everyday life. Colleagues and teachers may also notice, in work that is no longer steady and instructions that need repeating. The person using cocaine may be the last to see it, because the changes feel normal from inside and the brain adapts to the pattern.

What makes the harm of Cocaine to memory worse?

Using cocaine more often, in larger amounts or over a longer time generally increases the harm, because the brain gets less chance to recover between uses. Poor sleep, skipped meals and existing health problems can also make the harm worse, because the brain needs sleep and energy to store memories properly. Mixing cocaine with other substances can multiply the danger, especially for the heart, breathing and consciousness, and stress can add to the strain on memory.

Where can I read reliable information about Cocaine and memory?

Reliable general information about cocaine can be found from public health authorities such as NIDA, the NHS, the WHO, the CDC and the DEA, listed in the sources below. Those sources explain harms, risks and patterns of use in plain language, without selling anything or offering personal advice. For questions about a specific person, the right step is a conversation with a qualified health professional, not an article.

Sources

This article is general information only. It is not personal medical advice. For questions about a specific person, speak with a qualified health professional.