It’s not uncommon to find cannabis consumers who also use psychoactive mushrooms, and vice versa. The internet is full of articles about self-administering psilocybin and marijuana together, with anecdotal reports from people who perceive an enhanced effect from the combination.

What does the science say about how these two substances affect the consumer when taken together?

People have combined the two compounds for decades—if not centuries. One 2006 study that looked into polysubstance use among university students found that of the 149 students surveyed, nearly 60% regularly co-administered cannabis and psilocybin (the active ingredient in psychedelic mushrooms).

That co-administration remained mostly limited to the experimentation of younger…

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