The contribution of cannabis use to variation in the incidence of psychotic disorder across Europe

High-strength cannabis increases risk of mental health problems

  1. TheBigBadWolf
    Study Author(s):
    Marta Di Forti, Diego Quattrone, Tom P Freeman, Giada Tripoli, Charlotte Gayer-Anderson, Harriet Quigley, Victoria Rodriguez, Hannah E Jongsma, Laura Ferraro, Caterina La Cascia, Daniele La Barbera, Ilaria Tarricone, Domenico Berardi, Andrei Szöke, Celso Arango, Andrea Tortelli, Eva Velthorst, Miguel Bernardo, Cristina Marta Del-Ben, Paulo Rossi Menezes, Jean-Paul Selten, Peter B Jones, James B Kirkbride, Bart PF Rutten, Lieuwe de Haan, Pak C Sham, Jim van Os, Cathryn M Lewis, Michael Lynskey, Craig Morgan, Robin M Murray, and the EU-GEI WP2 Grou
    Journal Name:
    thelancet
    Publication Date:
    march 19, 2019
    Many countries have legalised or decriminalised cannabis use, leading to concerns that this might result in an increase in cannabis use and associated harm,even if the latter only affects a minority of the population. Crosssectional and prospective epidemiological studies as well as biological evidence6 support a causal link between cannabis use and psychotic disorder. Metaanalysis shows a dose–response association with the highest odds of psychotic disorder in those with the heaviest cannabis use.7 Nevertheless, it is not clear whether, at a population level, patterns of cannabis use influence rates of psychotic disorder.