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The dangers of Marijuana Articles| Volume 6, ISSUE 5, P427-436, May 01, 2019 The contribution of cannabis use to variation in the incidence of psychotic disorder across Europe (EU-GEI): a multicentre case-control study Cannabis use is associated with increased risk of later psychotic disorder but whether it affects incidence of the disorder remains unclear. We aimed to identify patterns of cannabis use with the strongest effect on odds of psychotic disorder across Europe and explore whether differences in such patterns contribute to variations in the incidence rates of psychotic disorder. Marta Di Forti, PhD Diego Quattrone, MD Tom P Freeman, PhD Giada Tripoli, MSc Charlotte Gayer-Anderson, PhD Harriet Quigley, MD https://www.thelancet.com/journals/lanpsy/article/PIIS2215-0366(19)30048-3/fulltext