Bupropion, sold under the name Wellbutrin, is an antidepressant often prescribed to help a person quit smoking. Michelle Del Guercio/Science Source hide caption

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E-cigarettes work by heating up a fluid that contains the drug nicotine, producing a vapor that users inhale. The devices are most popular among young adults, ages 18 to 24, a federal survey indicates. iStockphoto hide caption

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Most E-Cigarette Users Are Current And Ex-Smokers, Not Newbies

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A woman smokes a cigarette in a Beijing shopping market, even though the practice is now banned inside public spaces. Kevin Frayer/Getty Images hide caption

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How Does A City Stop 4 Million Smokers From Lighting Up?

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Smokers More Likely To Quit If Their Own Cash Is On The Line

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Daniel Gomez (from left), Lister Sena and Ricardo Alvarez were laid off after working for years with Philip Morris in Uruguay. They are now inspectors enforcing the country's tough anti-smoking laws. Lourdes Garcia-Navarro/NPR hide caption

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Once Philip Morris Workers, Now They Clamp Down On Uruguay's Smokers

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Can Family Secrets Make You Sick?

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Tobacco smokers are more likely than nonsmokers to die from infection, kidney disease and, maybe, breast cancer. iStockphoto hide caption

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Smoking's Death Toll May Be Higher Than Anyone Knew

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An employee in a Sydney bookshop in 2012 adjusts packaged cigarettes, which have to be sold in identical olive-brown packets bearing the same typeface and largely covered with graphic health warnings. William West/AFP/Getty Images hide caption

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Vapor from an e-cigarette obscures the user's face in a London coffee bar. Dan Kitwood/Getty Images hide caption

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E-Cigarettes Can Churn Out High Levels Of Formaldehyde

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The headquarters of Reynolds American in downtown Winston-Salem, N.C.. Starting in January, workers there will no longer be allowed to smoke at their desks. Chris Keane/Reuters/Landov hide caption

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Cigarette-Maker Reynolds American To Ban Smoking At Work

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Smoking has declined by about 4 percent annually in Uruguay since the country required graphic warnings on cigarette packages. Matilde Campodonico/AP hide caption

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Philip Morris Sues Uruguay Over Graphic Cigarette Packaging

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