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Lancet. 1987 Dec 26;2(8574):1483-6.

Cannabis and schizophrenia. A longitudinal study of Swedish conscripts.

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  • 1Karolinska Institutet, Department of Social Medicine, Huddinge, Sweden.


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.

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