The multibillion-dollar Mexican opium trade starts here, with poppy farmers so poor they live in wood-plank, tin-roofed shacks with no indoor plumbing.
Mexican farmers from three villages interviewed by the Associated Press are feeding a growing addiction in the U.S., where heroin use has spread from back alleys to the cul-de-sacs of suburbia.
The heroin trade is a losing prospect for everyone except the Mexican cartels, who have found a new way to make money in the face of falling cocaine consumption and marijuana legalisation in the United States. Once smaller-scale producers of low-grade black tar, Mexican drug traffickers are now refining opium paste into high-grade white heroin and flooding the world's largest market for illegal drugs, using the distribution routes they built for marijuana and cocaine.
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