Cannabis use and outcome of recent onset psychosis
European Psychiatry June 1, 2005 Anton Grech, Jim Van Os, Peter B. Jones et al.
AbstractPurposeTo test the hypothesis that recent onset psychotic patients who use cannabis will have psychotic symptoms that are more severe and more persistent than those who do not use cannabis.Subjects and methodsWe carried out a 4-year follow-up study of a cohort of 119 patients with recent onset of psychosis. The patients were divided into four groups according to duration of cannabis...