We often advise people to moderate their alcohol consumption. We suggest limits, alcohol-free days and avoiding heavy drinking. Why, then, do we take a different approach to cocaine and other drugs? Why not simply advise people to use them occasionally and in moderation?
It is a reasonable question, and it deserves an honest answer. The honest answer is not that cocaine and alcohol are fundamentally different kinds of substance. It is that one of them can be measured, and the other cannot.
We know roughly how much alcohol is in a pint of beer, a glass of wine or a measure of spirits. The label tells us. The UK’s low-risk drinking guideline of 14 units a week exists because that measurement is possible: you can add up units across a week and compare the total to a published threshold.
That guideline is called low-risk, not safe, for good reason. Alcohol is not harmless even within it, and health risks increase as consumption rises. But the point stands: a drinker who wants to moderate has a number to work with.
A person buying cocaine has no equivalent number. Illicit cocaine is not produced or sold within any regulated system. The buyer cannot reliably know its strength, how it was produced, or what else has been added to it. The Home Office’s own monitoring has recorded cocaine powder purity swinging from 51% in 2003 down to a low of 20% in 2009, then back up to 63% by 2018, the highest level on record at that point, and the National Crime Agency’s most recent assessment reports UK cocaine seizures up more than 440% over the past decade alongside sustained high purity. Whatever the exact figure in any given year, the pattern is the same: strength moves substantially over time and varies between batches and dealers, with no label to tell the buyer which version they have. Two amounts that look and feel identical to the user can differ enormously in actual strength. A person who has learned to judge “their usual amount” by eye or by habit can unknowingly take a far stronger dose than they intend.
This is what makes cocaine different from alcohol in practice, not in principle. It is not that cocaine is inherently unmoderable and alcohol is not. It is that moderation depends on being able to measure what you are taking, and with cocaine, you cannot.
Cocaine sharply increases heart rate and blood pressure. It can contribute to panic, seizures, dangerous changes in heart rhythm, heart attack and stroke. These events are more likely with heavier or more frequent use, but because strength cannot be judged in advance, they can also occur unexpectedly, including in people who have used the same “amount” many times before without incident.
The danger compounds when cocaine is combined with alcohol, which happens often. When both are present in the body, the liver produces a substance called cocaethylene, found in roughly three-quarters of people who use cocaine and drink at the same time. Cocaethylene stays in the system longer than cocaine alone and is more toxic to the heart. A 2024 systematic review of the cardiovascular evidence found that its presence is associated with an 18 to 25-fold increase in the risk of sudden death compared with cocaine used without alcohol, and separate emergency department research has found meaningfully higher rates of cardiac arrest in patients who had used both substances together. Alcohol also makes cocaine’s effects harder to judge in the moment: it can reduce inhibition and mask how intoxicated someone actually is, making it easier to take more of either substance than intended.
None of this requires heavy or long-term use to matter. It is a risk built into not knowing what you are taking, and it applies on a single occasion as much as a pattern of them.
It is a fair question, and worth answering directly rather than avoiding. If cocaine were legally produced, tested and sold with its exact strength printed on the packet, the specific risk described above, taking a dose far stronger than intended because its strength was unknown, would largely disappear. That is a real and honest concession. We are not arguing that cocaine is dangerous purely because it happens to be illegal, or that regulation could never reduce some of its acute harms.
But known strength does not address the other two problems this piece describes. Cocaine’s short-lived effects and sharp comedown create a pull toward redosing that has nothing to do with labelling; a precisely measured dose still wears off in a similar way and still leaves the same drop behind it. And once someone has developed a dependent relationship with a substance, control does not return simply because the dose is now certain. Pharmaceutical-grade cocaine has been used in medicine for decades, and precise, regulated stimulants such as prescription amphetamines are used by millions of people worldwide; known purity has not made either of these moderation-proof for the minority who develop problems with them. Alcohol itself, legal, regulated and labelled with its exact strength, remains one of the most harmful drugs in the UK once total harm to individuals and society is counted. Known dosing did not solve moderation failure for alcohol, and there is no strong reason to expect it would behave differently for cocaine.
We take no position here on the wider policy question of drug legalisation, which is genuinely contested among researchers and reasonable people. Our point is narrower: in the world as it currently exists, illicit cocaine carries an added, distinct risk from not knowing its strength, on top of the addiction and dependency risks it carries regardless of how it is produced or sold.
It would be dishonest to claim otherwise. Some people use cocaine occasionally and stop, without entering treatment or experiencing obvious long-term problems, in the same way millions of people drink without becoming alcohol-dependent.
But the unpredictability of strength does not go away just because someone is using infrequently or in small amounts. The risk described above is not a risk that only applies to heavy users. It applies to anyone taking a substance whose actual strength they cannot know. Occasional use is not the same as safe use; it is simply a smaller number of exposures to an unmeasurable risk.
Even setting purity aside, cocaine works against the kind of moderation we ask of alcohol. Its effects are powerful but short-lived, and the drop that follows, anxiety, low mood, a strong urge to use again, creates a cycle in which the person who intended a small amount often ends up using considerably more than planned, simply to manage the comedown. Alcohol has nothing quite equivalent built into its pharmacology. A person can nurse one pint for an hour. Cocaine’s own comedown actively works against nursing a small amount.
This does not happen to everyone, every time. But when it becomes a pattern, and at OHC it is a pattern we see often, advice to “use moderately” may have very little practical meaning, because the substance itself is undermining the moderation as it happens.
At OHC, we work mainly with people for whom moderation, with alcohol, cocaine, or both, has already and repeatedly failed. Many have tried changing what they drink or use, setting limits, using only at weekends, stopping for short periods. The problem was rarely a lack of information. It was that they had developed a relationship with the substance in which control had become unreliable.
Warning signs of that shift are familiar: using more or for longer than intended, repeatedly failing to cut down, becoming preoccupied with obtaining or using, spending money needed for essentials, continuing despite worsening physical or mental health, hiding or lying about use, missing responsibilities, using the substance to feel normal rather than to feel good, returning to it despite genuinely intending not to.
Once these patterns are established, the theoretical existence of controlled cocaine use elsewhere in the population stops being the relevant question. The relevant question is whether it is possible for this person, and their own history of trying and failing to moderate is usually the clearest evidence available.
For them, abstinence is not a punishment. It is a practical response to what repeatedly happens when they use, whatever the substance.
Rejecting cocaine as a substance that can be recommended in safe, moderate amounts does not mean rejecting people who continue to use it. If someone is not ready or able to stop, practical harm-reduction advice, including drug-checking where it is available, can reduce immediate danger. Treatment services should meet people honestly and without judgement, wherever they are. Keeping someone alive and connected to support has to come before demanding perfection.
Harm reduction and recovery are not enemies. Harm reduction is often the first step towards recovery; it can create the time, safety and trust a person needs before they are ready to make a larger change. But reducing harm is not the same as declaring cocaine use safe, and it does not mean controlled use will be achievable for someone who has repeatedly lost control.
OHC does not claim that everyone who drinks or uses cocaine is addicted, and we do not believe fear, shame or exaggeration helps anyone recover. We support abstinence because we work with people whose attempts at moderation have repeatedly broken down, and because for cocaine specifically, moderation asks someone to reliably manage a dose they can never actually know. Each new rule creates another negotiation: how much, how often, with whom, on which day, under what circumstances, against a strength they cannot verify.
Abstinence removes that negotiation. It does not solve every problem; people still have to address their mental health, relationships, finances, behaviour and the reasons the substance became so important to them. But it creates the space in which that work can begin.
Moderate alcohol consumption is not risk-free, and occasional cocaine use clearly exists. But the two are not equivalent recovery goals, because one can be measured against a known quantity and the other cannot. Illicit cocaine’s uncertain and rising strength means serious harm can occur unpredictably, its pharmacology works against sustained moderation even when someone intends it, and combining it with alcohol introduces a further, well-evidenced danger through cocaethylene. Once addiction has developed, moderation becomes progressively less reliable regardless of the substance.
We should offer harm-reduction advice to people who continue to use drugs, without judgement and without abandoning them. But for someone whose life is being damaged by cocaine, abstinence is often the clearest and most realistic route out, not because cocaine is treated as uniquely sinister, but because it cannot be dosed the way alcohol can.
Recovery is not about proving that a person should be able to control cocaine. It is about helping them build a life in which they no longer need to.