CNN.com - Health: Nothing to smile about: Asia's deadly addiction to betel quids

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Nothing to smile about: Asia's deadly addiction to betel quids Nov 4th 2013, 08:02 Heavy users of betel quids reveal their addiction when they smile. Their teeth are stained a reddish-black, dyed from years of chewing potent parcels of areca nuts and tobacco, wrapped in a lime-coated betel leaf.

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