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Teens and young adults with frequent cannabis use who underwent a cognitive control task had reduced brain activity in the frontostriatal circuits involved in conflict resolution and cognitive control, compared with those who didn’t use cannabis, with elevated and more persistent changes among those with earlier cannabis initiation, researchers reported in the Journal of the American Academy of Child & Adolescent Psychiatry. The findings were based on functional MRI scans from 60 youths ages 14 to 23. Psych Central (6/22)