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, 19 March 2019

This large multicentre case-control study conducted across 11 sites in Europe and Brazil found that daily cannabis use was associated with increased odds of psychotic disorder compared with people who had never used cannabis, increasing to nearly five-times increased odds for daily use of high-potency types of cannabis.

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