E-cigarette vaporizers are displayed at Digital Ciggz in San Rafael, Calif. The Department of Transportation says you definitely can't use this or anything else to vape on a plane. Justin Sullivan/Getty Images 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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Will this maker of snus, an alternative to cigarettes, be allowed to claim it is less harmful? Swedish Match hide caption

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Swedish Match

Tobacco Firm Seeks Softer Warning For Cigarette Alternative

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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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Tobacco giant Reynolds American is buying Lorillard and acquiring Newport, a popular menthol cigarette. In a shrinking market, Newport is one of the few U.S. brands gaining market share. It is particularly popular among African-American smokers. Justin Sullivan/Getty Images hide caption

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Amid Smoking Decline, Look Who's Still Lighting Up

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A woman tries electronic cigarettes at a store in Miami. Joe Raedle/Getty Images hide caption

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Joe Raedle/Getty Images

FDA Moves To Regulate Increasingly Popular E-Cigarettes

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Vaporizer pens look like the e-cigarettes that dispense nicotine. But these devices are optimized for a potent marijuana resin with high concentrations of THC. Courtesy of Grenco Science hide caption

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Courtesy of Grenco Science

Pot Smoke And Mirrors: Vaporizer Pens Hide Marijuana Use

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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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OK To Vape In The Office? Cities, Feds And Firms Still Deciding

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Blair Roberts, a 22-year-old sales associate at Colorado E-Smokes, "vapes" with an electronic cigarette in the Aurora, Colo., store. In the absence of federal rules, Colorado is among states that considered its own age requirements for the nicotine-delivery devices. Ed Andrieski/AP hide caption

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Ed Andrieski/AP

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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Joe Raedle/Getty Images

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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Jenny Lei Bolario/Youth Radio

Candy Flavors Put E-Cigarettes On Kids' Menu

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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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Reed Saxon/AP

Surgeon General Adds New Risks To Long List Of Smoking's Harms

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