of all those who have ever used marijuana 9% of them became dependent; for alcohol the corresponding figure is a substantially higher 15%, and for tobacco 32%. What are the statistics for heroin, crack, PCP, methamphetimines, barbituates and the rest?
of all those who have ever used marijuana 9% of them became dependent; for alcohol the corresponding figure is a substantially higher 15%, and for tobacco 32%. What are the statistics for heroin, crack, PCP, methamphetimines, barbituates and the rest?
Heroin, 23%, cocaine, 17%; no info on the rest.