Abstract
Given our current preoccupation with conducting a war on drugs, we run the danger of forgetting that, once upon a time, the sale of opium was widely condoned and, in some Asian societies under colonial rule, even monopolized by the state. While this clearly encouraged the widespread use of opium in these societies, some have claimed that it at least served to keep more dangerous and addictive drugs at bay. Within Asia there is no question that the postwar era has seen a dramatic shift away from opium to other addictive drugs, in particular heroin, and that this has coincided with the introduction of anti-opium laws. Are we then justified in concluding that the success of the anti-opium movement in prohibiting opium has served to encourage the spread of heroin?

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