Electronic cigarettes; Electronic cigarette refill cartridges sold empty; Liquid nicotine solutions for use in electronic cigarettes; Electronic cigarette liquid (e-liquid) comprised of vegetable glycerin; Electronic cigarette liquid (e-liquid) comprised of propylene glycol; Electronic cigarette liquid (e-liquid) comprised of flavorings in liquid form, other than essential oils, used to refill electronic cigarette cartridges; Electronic cigarette cases; Electronic cigarette lighters; Electronic cigarette holders; Battery-powered, rechargeable portable vaporizing units in the nature of electronic cigarettes and smokeless cigarette vaporizing pipes; disposable electronic cigarette liquid (e-liquid) refill cartridges sold filled with vegetable glycerin, propylene glycol, and vaporizable nicotine, for use with battery-powered, rechargeable portable vaporizing units in the nature of electronic cigarettes and smokeless cigarette vaporizer pipes