Adolescents who smoke marijuana as early as 14 do worse by 20 points on some cognitive tests and drop out of school at a higher rate than non-smokers. But if they hold off until age 17, they’re less at risk.
Adolescents who smoke marijuana as early as 14 do worse by 20 points on some cognitive tests and drop out of school at a higher rate than non-smokers. But if they hold off until age 17, they’re less at risk.