Is cannabis more dangerous than alcohol?
Is cannabis more dangerous than alcohol? There is no blanket answer, because both substances can harm health and cause dependence. Which of them is riskier for you depends above all on quantity, frequency, age and your state of health.
This article sets the documented risks of cannabis against the known limits for alcohol. It plays neither substance down. The aim is for you to know the differences and to be able to assess your own situation realistically.
What specialist services say about cannabis
The BIÖG points out that the young brain is in an important phase of development and that cannabis use can affect this development. In addition, the prevention service notes that psychoses occur more often among people who use cannabis. These risks apply regardless of the fact that possession is now permitted.
Dependence is also a real problem. According to the BIÖG, roughly one in eight people who use cannabis become dependent. The drugcom page adds that long-term use can lead to psychological dependence. Typical of this is repeatedly wanting to cut down on use without succeeding.
What alcohol means in comparison
According to drugcom, cannabis is the most widely used drug in Germany after alcohol and tobacco. This article gives no figures on health damage caused by alcohol. For road traffic, the legislator has set a clear limit: from 0.5 per mille of alcohol in the blood, an offence is committed, which is penalised under section 24a of the Road Traffic Act (StVG).
An honest self-observation is helpful. Three questions can guide you:
- How much do you consume on one occasion, and how often does it happen?
- Do you notice that you can control it less than you intended?
- Do you consume to manage stress, sleep or feelings?
Health and dependence compared directly
The table sets the most important points side by side. It shows only what is substantiated, and therefore gives no ranking.
| Feature | Cannabis | Alcohol |
|---|---|---|
| Limit in road traffic | 3.5 nanograms of THC per millilitre of blood serum (§ 24a para. 1a StVG); for people under 21 and during the probationary period, drugcom states that a complete ban on cannabis applies | 0.5 per mille in the blood (§ 24a StVG) |
| Dependence | According to the BIÖG, roughly one in eight users | No comparable figure is given here |
| Memory and school qualification | The BIÖG warns of poorer memory and a qualification at risk | No information is given here |
Why a comparison is difficult
Drugcom describes the physical component of cannabis dependence as less pronounced than alcohol or heroin dependence, but unpleasant enough that use can be resumed. A clean comparison would need figures on harm, treatment and follow-up costs for both substances under comparable conditions. Such data is not available here. A ranking would therefore be an opinion and could not be substantiated.
The person also matters. Anyone who starts using early, has pre-existing mental health conditions or regularly takes larger amounts carries a higher risk. This applies to alcohol just as it does to cannabis. According to cannabispraevention.de, cannabis and alcohol together place a strong burden on the circulation and often lead to nausea and vomiting. According to drugcom, mixed consumption is completely prohibited in road traffic.
Typical misjudgements
A common error is the view that what is legal cannot be that bad. Legality only says something about the law and nothing about the effect on the body. A second error is the view that alcohol is a recreational product and cannabis a drug. Both are psychoactive substances, and both can cause problems.
The question of whether one has one’s use under control is also often answered wrongly. Anyone who considers their use controlled rarely checks this against a clear standard. It helps to write down amounts and frequency for one week.
What this means for your daily life
A comparison only helps if it leads to a decision. For this, it is often enough to look openly at one’s own habits. Two questions are particularly helpful: would you cut back on use even if no one would notice? And would you forgo driving if in doubt? Anyone who hesitates on these questions should look more closely at their use.
If you are unsure, read What health effects does cannabis have overall? There you will find the documented effects in context, and you can compare them with your own situation.
How body and brain react
According to drugcom, the spectrum of effects of cannabis is broad: it depends on the form of use, the amount of active ingredient, the situation and one’s mood. When smoked, the effect peaks after about 15 minutes and is largely over after two to three hours. When eaten or drunk, it is less predictable. According to drugcom, the acute effect directly reduces performance in perception, attention and reaction ability. Feel-ok.ch names negative effects on concentration and reaction ability for both drugs.
Unlike alcohol, the breakdown of THC takes considerably longer than the effect lasts, according to drugcom. Driving ability can remain impaired even after the acute effect has faded. Road traffic law therefore sets limits that do not depend solely on one’s own feeling.
What you can concretely change in daily life
Anyone who wants to reduce their use or separate the two substances does not need a perfect strategy. Small, checkable steps are a possible start.
- Set fixed days on which you use nothing, and stick to them for a while.
- Plan evenings so that you do not have to drive yourself at the end.
- Tell your friends about your intention and ask them for support.
- After each evening, briefly note how you feel the next morning.
If these steps do not succeed for you, this is a sign that support would make sense. A counselling service helps to discuss such situations together and to develop a realistic plan.
What the comparison means for young people
For young people, the question is particularly important, because the brain is still developing. The BIÖG points out that young people tend to downplay cannabis use. Anyone who is young should therefore approach both substances with particular restraint.
Where to get help
You can contact an addiction counselling service if you are worried about your use. The Deutsche Hauptstelle für Suchtfragen runs a Suchthilfeverzeichnis, through which you can find counselling services near you. For health questions, a doctor is the right point of contact. The limits in road traffic are set out in the legal text of section 24a StVG.
Frequently asked questions
Is cannabis more dangerous than alcohol?
There is no blanket answer. Both substances can harm health and cause dependence. According to the BIÖG, roughly one in eight people who use cannabis become dependent. In road traffic, clear limits apply to both substances under § 24a StVG. Which substance is riskier for you depends on quantity, frequency and your health.
Is there risk-free cannabis use?
No risk-free amount is named. According to the BIÖG, the health risk grows the longer and more often someone uses cannabis, and the younger they are. For young people the risk is particularly high, because the brain is still developing. Adults who use cannabis can limit quantity and frequency and avoid mixing it with alcohol. Anyone who notices that use is getting out of control should contact an addiction counselling service.