Cannabis and schizophrenia. A longitudinal study of Swedish conscripts.
The association between level of cannabis consumption and development of schizophrenia during a 15-year follow-up was studied in a cohort of 45,570 Swedish conscripts. The relative risk for schizophrenia among high consumers of cannabis (use on more than fifty occasions) was 6.0 (95% confidence interval 4.0-8.9) compared with non-users. Persistence of the association after allowance for other psychiatric illness and social background indicated that cannabis is an independent risk factor for schizophrenia.
D000328:Adult; D000704:Analysis of Variance; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D002189:Marijuana Abuse / Q000150:complications*; D008889:Military Personnel; D011336:Probability; D012307:Risk Factors; D012559:Schizophrenia / Q000139:chemically induced*; D011795:Surveys and Questionnaires; D013548:Sweden