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Associated Press
FILE - In this Feb. 20, 2014, File photo, a patron exhales vapor from an e-cigarette at the Henley Vaporium in New York. The first peek at a major study of how Americans smoke suggests many use combinations of products, and often e-cigarettes are part of the mix. It's a preliminary finding, but it highlights some key questions as health officials assess electronic cigarettes. (AP Photo/Frank Franklin II, File)

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