Cannabis May Precipitate Psychosis


In a study of 785 patients with a psychotic disorder, researchers from The Netherlands found that cannabis us was associated with an earlier onset of psychosis and may precipitate psychosis.  Onset of psychosis occurred almost two years earlier among users of cannabis, and the age of most intense cannabis use preceded age of first psychosis in 63.5% of cannabis-using patients. Results will appear in Psychological Medicine.

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Kermit Cole
Kermit Cole, MFT, founding editor of Mad in America, works in Santa Fe, New Mexico as a couples and family therapist. Inspired by Open Dialogue, he works as part of a team and consults with couples and families that have members identified as patients. His work in residential treatment — largely with severely traumatized and/or "psychotic" clients — led to an appreciation of the power and beauty of systemic philosophy and practice, as the alternative to the prevailing focus on individual pathology. A former film-maker, he has undergraduate and master's degrees in psychology from Harvard University, as well as an MFT degree from the Council for Relationships in Philadelphia. He is a doctoral candidate with the Taos Institute and the Free University of Brussels. You can reach him at [email protected].


  1. And what is the root of the psychosis? Especially in a younger individual. Let’s see, they get “high” then then feel guilty due to some propaganda they been force fed sometime in their past. They come from a not so nurturing childhood experience. As marijuana has to ability to allow some individuals “free flowing” thought, they become afraid that those of the not so nurturing environment will find out and they will be “punished”. I put forth, is it psychosis or a perceived inability to share one’s fears?

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  2. The variable here everyone is skipping over is the generic term “Cannabis.”

    That’s like saying the patient had an adverse psyche reaction to “Food”…

    There are literally hundreds of thousands of ‘strains’ of cannabis, each with their own unique cannabinoid profile.

    What we DO know (now) is that Prohibition itself is responsible for so called ‘dangerous pot’ that’s contributing to ‘psychosis’ and ‘schizophrenia’ in our youth.

    High doses of Dronabinol (Marinol) or high doses of pure THC will cause episodes of Manic Psychosis in just about anyone… Add CBD in sufficient amounts and the patient isn’t affected in the slightest.

    End Prohibition… Help End Cannabis Psychosis

    Keep it Clean! ;D

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