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SHORTENING an industry’s supply chain is bound to affect the activities of its suppliers. That is as true of the recreational-drugs business as it is of any other. Some street pharmaceuticals, such as methamphetamine and cannabis, are already produced near their main consumer markets—whether cooked up in laboratories or grown under cover. But others, particularly cocaine and heroin, still have to be imported from far-flung places where the plants which produce them flourish in the open (think of poppies in Afghanistan).