An employee "Vapologist" (R) stands behind the bar as he puffs on an e-cigarette with customers at the Henley Vaporium in New York City December 18, 2013. At the Henley Vaporium, one of a growing number of e-cigarette lounges sprouting up in New York and other U.S. cities, patrons can indulge in their choice of more than 90 flavors of nicotine-infused vapor, ranging from bacon to bubble gum. The growing popularity of e-cigarettes has not escaped the notice of the industry's critics, who have stepped up calls for new regulations, including bans on their use in public places, even though the scientific evidence about exposure to their vapors remains inconclusive. REUTERS/Mike Segar (UNITED STATES - Tags: DRUGS SOCIETY BUSINESS POLITICS)