"So internationally, "the war on drugs" provides a cover for intervention. Domestically, it has little to do with drugs but a lot to do with distracting the population, increasing repression in the inner cities, and building support for the attack on civil liberties.
That's not to say that "substance abuse" isn't a serious problem. At the time the drug war was launched, deaths from tobacco were estimated at about 300,000 a year, with perhaps another 100,000 from alcohol. But these aren't the drugs the Bush administration targeted. It went after illegal drugs, which had caused many fewer deaths -- over 3500 a year -- according to official figures. One reason for going after these drugs was that their use had been declining for some years, so the Bush administration could safely predict that its drug war would "succeed" in lowering drug use.
The Administration also targeted marijuana, which hadn't caused any known deaths among some 60 million users. In fact, that crackdown has exacerbated the drug problem -- many marijuana users have turned from this relatively harmless drug to more dangerous drugs like cocaine, which are easier to conceal. " - Noam Chomsky -