Some employees say e-cigarettes increase their productivity and help them steer clear of tobacco. But health regulators are looking into possible risks to e-cig users — and to co-workers. iStockphoto hide caption

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Electronic cigarettes are actually battery operated devices that use a heating element to atomize a flavored liquid, typically containing nicotine, so that it can be inhaled. Joe Raedle/Getty Images hide caption

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Kids as young as 13 purchase e-cigarettes, or "vape pens," online, where independent sellers don't necessarily ask a buyer's age. Jenny Lei Bolario/Youth Radio hide caption

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A CVS pharmacy in Orlando, Fla., is one of more than 7,600 stores where the company will stop selling tobacco products by October. John Raoux/AP hide caption

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Smoking can mess up your looks, according to an ad campaign aimed at keeping teens from smoking. Courtesy of U.S. Food and Drug Administration hide caption

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John Hartigan, proprietor of Vapeology LA, a store selling electronic cigarettes and related items, takes a puff from an electronic cigarette in Los Angeles. Reed Saxon/AP hide caption

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Tobacco companies incorporated doctors in their ads, such as this 1930 Lucky Strike campaign, to convince the public that smoking wasn't harmful. Stanford University hide caption

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Illustration by Daniel Horowitz for NPR

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