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

Cannabis and schizophrenia. A longitudinal study of Swedish conscripts.

Andréasson S, Allebeck P, Engström A, Rydberg U.

Source

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

Abstract

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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