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The World in Medicine
June 16, 2004

Cannabis Consequences

JAMA. 2004;291(23):2809. doi:10.1001/jama.291.23.2809-b

Although cannabis use has been associated with psychological and social problems, there is no evidence that the practice actually causes such problems, according to researchers from England and Switzerland (Lancet. 2004;363:1579-1588).

The researchers reviewed 48 long-term studies that examined the association between illicit drug use reported by adolescents and young adults and later psychological or social problems. They found, based on an analysis of 16 studies they judged to be of higher quality, that the data indicated that adolescents who used marijuana were more likely than peers who did not use the drug to have attained a lower educational level and use other illicit drugs, but that it did not demonstrate a consistent association between marijuana use and psychological or behavioral problems.

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