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Another Reason Teenagers Should Avoid Cannabis

A longitudinal study links heavy use in early adolescence with later problems in executive functioning.

More than one third of high-school seniors have reported using marijuana in the previous year. To elucidate the potential effect of adolescent marijuana use on cognitive function, investigators surveyed a community sample of 387 adolescents, along with a caregiver, nine times between ages 11–12 and 20–21. Questionnaires were used to assess past-year marijuana use, alcohol use, conduct disorder, and the executive functions of attentional and inhibitory control.


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