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Some studies have suggested cannabis use as a risk factor for psychosis, but these studies failed to control for predisposition to psychosis and other confounders. In a German population-based study, researchers used personal interviews at baseline and 4 years later to examine the effects of marijuana use in 2437 young subjects (age range, 14-24). Prevalence of lifetime cannabis use (at least 5 times) was 13% at baseline and 15% at follow-up. Lifetime incidence of one psychotic symptom (based on the Composite International Diagnostic Interview) at follow-up was 17% and incidence of at least two symptoms was 7%. Researchers adjusted results for self-reported psychoticism and paranoia scores at baseline ("psychotic predisposition"), demograph…