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Whether use of marijuana in adolescence leads to psychiatric problems in early adulthood has not been definitively answered. These researchers examined the question in a meta-analysis and systematic review.
The meta-analysis involved 11 longitudinal, prospective cohort studies of cannabis use at age 18 or younger and later depression, anxiety, and suicidality at ages 18 through 32. All studies controlled for baseline depression. In pooled analyses, cannabis use in adolescence significantly increased the risks in early adulthood for depression by 37%, suicidal ideation by 50%, and suicide attempts in adolescence or young adulthood by 346%.
Another 24 studies that reported data differently from the pooled studies could not be included in the me…