A selection of "Nicotine Containing Products", or "NCP"s are displayed during "The E-Cigarette Summit" at the Royal Academy in central London on November 12, 2013. The merits of e-cigarettes were thrashed out at a one-day gathering of scientists, experts, policymakers and industry figures at the Royal Society in London. The use of electronic cigarettes -- pen-sized battery-powered devices that simulate smoking by heating and vaporising a liquid solution containing nicotine -- has grown rapidly. AFP PHOTO / LEON NEAL (Photo by LEON NEAL / AFP via Getty Images)
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