Marijuana use linked to worse school outcomes for teens

Generations of parental warnings may not be wrong: A massive study of available data finds teens who use marijuana have significantly worse outcomes at school.

Data from 63 studies involving almost 440,000 youths found "cannabis use during adolescence is probably associated with lower school grades; less likelihood of high school completion, university enrollment and post-secondary degree attainment; and increased school dropout rate and school absenteeism," according to Canadian researchers.

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