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Teenagers and young adults who frequently use marijuana may be hurting their brainpower, according to studies about pot and adolescence presented today at the American Psychological Association’s annual convention. Krista Lisdahl, director of the brain-imaging and neuropsychology lab at the University of Wisconsin-Milwaukee says that a close look at the under-25 age group shows cognitive decline, poor attention and memory and decreased IQ among those who regularly smoke pot, defined as at least once a week. Lisdahl added that recent studies are showing increases in marijuana use among high school seniors and young adults.

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