[#item_full_content] Using marijuana just once or twice a month was associated with worse school performance and emotional distress for teens, according to a large national study of adolescents led by Ryan Sultán, an assistant professor of clinical psychiatry at Columbia University Vagelos College of Physicians and Surgeons. 
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Marijuana use associated with worse school performance and emotional distress for teens
ByPot Shop News
December 23, 2025