Cannabis use linked to earlier onset of psychosis

Cannabis users develop psychosis an average of two-and-a-half years earlier than nonusers, a new meta-analysis by UNSW Sydney researchers shows. This earlier onset of psychosis becomes more pronounced with age, stretching to a difference of more than six years between cannabis users and nonusers who develop psychosis in their 30s, according to the global analysis, published in Biological Psychiatry.

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