California is the second state to raise the legal age for purchasing tobacco products from 18 to 21. A similar law went into effect in Hawaii on Jan. 1. Paul J. Richards/AFP/Getty Images hide caption

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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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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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FDA Moves To Regulate Increasingly Popular E-Cigarettes

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