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Marijuana’s effects on young brains diminish 72 hours after use, research says
NEW YORK -- Marijuana is notorious for slowing certain cognitive functions such as learning, memory and attention span, but research in young people suggests that these cognitive effects, while significant, may not persist for very long, even among chronic users. The meta-analysis, published Wednesday in the journal JAMA Psychiatry, combines data from 69 previous studies that look at the effects of heavy cannabis use on cognitive functioning in adolescents and young adults.