“…ECIGs are a class of products/devices that use an electrically-powered heating element to aerosolize a liquid solution that often contains a combination of propylene glycol, vegetable glycerin, nicotine, and chemical flavorings. The vast majority of adult ECIG users are either current or former combustible cigarette smokers (Shoenborn and Gindi, 2015), however, a small percentage of adult never-tobacco users also use ECIGs (e.g., Barnett et al, 2015; CDC, 2013; Dockrell et al, 2013; Hamilton et al, 2014; King et al, 2013, 2015; Krishnan-Sarin et al, 2015; Loukas et al, 2015; McMillen et al, 2012, 2014; Porter et al, 2015; Saddleson et al, 2015; Sutfin et al, 2013; Wang et al, 2014). One product characteristic of ECIGs that is unique from combustible cigarettes is the availability of a wide variety of flavors.…”