<p>A patron exhales vapor from an e-cigarette at the Henley Vaporium in New York, Feb. 20, 2014.</p>
March 11, 2015
Stories this photo appears in:
March 11, 2015 9 p.m.
Study: Smokers may tap into multiple sources for nicotine
E-cigarette research is one of a number of projects scientists are watching
WASHINGTON - 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.