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

itoggle caption Justin Sullivan/Getty Images

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

itoggle caption Jenny Lei Bolario/Youth Radio

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

itoggle caption Courtesy of U.S. Food and Drug Administration

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

itoggle caption Reed Saxon/AP

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

itoggle caption Stanford University