The contribution of cannabis use to the incidence of psychotic disorders

An article has been published by The Lancet Psychiatry titled “The contribution of cannabis use to variation in the incidence of psychotic disorder across Europe: A multicentre case-control study”.  The study included patients aged 18-64 who presented with first episode psychosis to psychiatric services at 11 sites in Europe and Brazil. These patients were matched with controls, that were representative of local populations. Over a 5 year period, 901 patients with first episode psychosis were enrolled in the study, along with 1237 population controls.  Daily cannabis use was associated with increased odds of a psychotic disorder, compared with people who had never used cannabis. People using high potency cannabis daily had five times increased odds of developing a psychotic disorder.

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