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In this March 18, 2015 photo, Douglas Wallace, 26, poses for a portrait in an open-air crack cocaine market, known as a “cracolandia” or crackland, where users can buy crack, and smoke it in plain sight, day or night, in Rio de Janeiro, Brazil. Collectively, the estimated 1 million crack users in Brazil are a frightening blight that's deeply troubling to government officials, whose programs have done little to halt the drug's march across the nation. Some recent studies have shown that Brazil now consumes more crack than any other country. (Photo by Felipe Dana/AP Photo)
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