This study published in the Archives of Pediatrics and Adolescent Medicine was done on 5,263 teenage students in Switzerland. When comparing users of only marijuana & users of marijuana & cigarettes it found that 22% more users of only marijuana play sports, 11% more users of only marijuana had better grades and used less alcohol & illegal drugs.
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Massive Marijuana Research Compilation - Quite possibly the most comprehensive website covering research on marijuana that's ever existed.
