Electronic cigarettes; Cartridges sold filled with chemical flavorings in liquid form for electronic cigarettes; Liquid nicotine solutions for use in electronic cigarettes; Flavorings, other than essential oils, for use in electronic cigarettes; Electronic cigarette liquid (e-liquid) comprised of flavorings in liquid form, other than essential oils, used to refill electronic cigarette cartridges; Electronic cigarette refill cartridges sold empty; Tobacco substitutes