Liquid nicotine solutions for use in electronic cigarettes; Electronic devices for the inhalation of nicotine-containing aerosols; Electronic cigarette mouthpieces; Electronic cigarette atomizers sold empty; Electronic cigarette refill cartridges sold empty; Electronic cigarette liquid (e-liquid) comprised of propylene glycol; Electronic cigarette liquid (e-liquid) comprised of vegetable glycerin; Electronic cigarette liquid (e-liquid) comprised of flavorings in liquid form, other than essential oils, used to refill electronic cigarette cartridges; Chemical flavorings in liquid form used to refill electronic cigarette cartridges; Electronic cigarettes