Many people who use magic mushrooms also use cannabis, and some combine mushrooms and weed in the same session. So how do psilocybin and cannabis interact? This harm reduction guide explains what research shows about the combination, why it can make an experience much more intense, and who should avoid it altogether.
This article is for general information only. It does not encourage drug use. Psilocybin is illegal in many countries, and cannabis laws also differ widely across Europe and the rest of the world.
Why People Combine Psilocybin and Cannabis
People give different reasons for mixing the two. Some use cannabis to calm nausea or nerves before the effects of mushrooms begin. Others smoke near the end of a session because they feel it brings back some of the effects. However, personal stories vary a lot. For some people, cannabis makes the experience feel richer, while for others it turns a calm trip into a confusing or frightening one.
What Research Shows About Psilocybin and Cannabis
Very few studies have looked at this question. The most useful one so far came from the Centre for Psychedelic Research at Imperial College London [1]. Researchers surveyed 321 people a week before and a day after a planned psychedelic experience. About 40% of them also used cannabis during the experience.
The results were clear in one way. People who used more cannabis reported more intense psychedelic effects, including stronger visual effects, more ego dissolution and higher scores for mystical-type experiences. The link with challenging experiences was more complex, and it did not simply rise with the dose. In addition, cannabis made no difference to emotional breakthroughs.
Still, this was an online survey, not a controlled trial. People chose for themselves whether to use cannabis, so the study cannot prove that cannabis caused the differences. Nevertheless, it supports what many users report: cannabis can make a psilocybin experience stronger and less predictable.
The Main Risks of Mixing
The biggest short-term risk is psychological. Cannabis can trigger anxiety, racing thoughts and paranoia on its own. During a psilocybin experience, these feelings can grow quickly and lead to a bad trip. In addition, cannabis potency varies widely. Modern high-THC products are much stronger than the cannabis of a few decades ago, so a small amount can have a large effect.
There are physical effects too. Both substances can raise heart rate, and some people feel dizzy or faint. Our article on psilocybin and the heart explains who should be especially careful.
Psychosis Risk: Who Should Avoid Mushrooms and Weed
Frequent cannabis use is linked to a higher risk of psychotic disorders. A large European study, carried out in cities such as London, Amsterdam, Paris and Madrid, found that daily cannabis use was linked to about three times higher odds of a psychotic disorder [2]. For daily use of high-potency cannabis, the odds were nearly five times higher. Earlier reviews had already pointed to a similar link [3].
Psilocybin research takes this seriously as well. Clinical trials usually exclude people with a personal or family history of psychosis or bipolar disorder. For these people, combining psilocybin and cannabis may carry the highest risk of all.
Harm Reduction Tips
The safest choice is not to combine substances at all. For people who decide to anyway, these points can reduce the risk:
- Start without cannabis: first learn how psilocybin alone affects you.
- Use far less than usual: even a small amount of cannabis can strongly change the experience.
- Avoid edibles: their delayed onset makes the dose hard to control.
- Plan the setting: a calm, familiar place and a sober sitter make a big difference. Read our guide to set and setting.
- Never drive: both substances impair driving, especially together.
Our magic mushroom dosage guide explains why a lower dose of psilocybin is also wise when adding any other substance. For another common combination, see our guide to psilocybin and alcohol.
Frequently Asked Questions
Does cannabis make mushrooms stronger?
Many people report that it does, and survey research supports this. However, controlled studies have not yet tested the combination.
Is it dangerous to mix weed and mushrooms?
The physical risks are usually low for healthy people, but the psychological risks are real. Anxiety, paranoia and confusion become more likely, especially at higher doses.
Does CBD have the same effect as THC?
There is little research on CBD and psilocybin. CBD does not cause a high, but it can still interact with other substances, so caution makes sense.
Conclusion: Psilocybin and Cannabis Make a Stronger Mix
Research suggests that psilocybin and cannabis together can produce a more intense and less predictable experience. For people with a risk of psychosis, the combination should be avoided. For everyone else, careful choices about dose, setting and support matter even more than usual. To learn more about the effects of psilocybin on its own, read our guide to psilocybin effects and safety.
Sources
- Kuc J, et al. Psychedelic experience dose-dependently modulated by cannabis: results of a prospective online survey. Psychopharmacology. 2022. doi:10.1007/s00213-021-05999-1
- Di Forti M, et al. The contribution of cannabis use to variation in the incidence of psychotic disorder across Europe (EU-GEI): a multicentre case-control study. The Lancet Psychiatry. 2019. doi:10.1016/S2215-0366(19)30048-3
- Moore THM, et al. Cannabis use and risk of psychotic or affective mental health outcomes: a systematic review. The Lancet. 2007. doi:10.1016/S0140-6736(07)61162-3
