Cannabis and schizophrenia. A longitudinal study of Swedish conscripts

Lancet. 1987 Dec 26;2(8574):1483-6. doi: 10.1016/s0140-6736(87)92620-1.


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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Analysis of Variance
  • Humans
  • Longitudinal Studies
  • Male
  • Marijuana Abuse / complications*
  • Military Personnel*
  • Probability
  • Risk Factors
  • Schizophrenia / chemically induced*
  • Surveys and Questionnaires
  • Sweden