Is cannabis use a contributory cause of psychosis?
Louisa Degenhardt, Wayne Hall
The Canadian Journal of Psychiatry | CANADIAN PSYCHIATRIC ASSOC | Published : 2006
OBJECTIVE: To assess whether cannabis use in adolescence and young adulthood is a contributory cause of schizophreniform psychosis in that it may precipitate psychosis in vulnerable individuals. METHOD: We reviewed longitudinal studies of adolescents and young adults that examined the relations between self-reported cannabis use and the risk of diagnosis with a psychosis or of reporting psychotic symptoms. We also reviewed studies that controlled for potential confounders, such as other forms of drug use and personal characteristics that predict an increased risk of psychosis. We assessed evidence for the biological plausibility of a contributory causal relation. RESULTS: Evidence from 6 lon..View full abstract