Continued cannabis use and risk of incidence and persistence of psychotic symptoms: 10 year follow-up cohort study

Abstract Objective To determine whether use of cannabis in adolescence increases the risk for psychotic outcomes by affecting the incidence and persistence of subclinical expression of psychosis in the general population (that is, expression of psychosis below the level required for a clinical diagnosis). Design Analysis of data from a prospective population based cohort study in Germany (early developmental stages of psychopathology study). Setting Population based cohort study in Germany. Participants 1923 individuals from the general population, aged 14-24 at