The first ever analysis of the global and regional prevalence of dependence upon the four major categories of illicit drugs - amphetamine, cannabis, cocaine, and opioids (such as heroin) - has revealed that opioid dependence causes the greatest health burden (overall death and illness) of all the illicit drugs. The results come from new analysis of the Global Burden of Disease Study 2010, and are published in The Lancet. For all of the drugs studied, over two thirds of dependent individuals were male (64% each for cannabis and amphetamines, and 70% each for opioids and cocaine)...
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