Vaping is the act of inhaling and exhaling vapor produced by an electronic cigarette or personal vaporizer. These devices are battery-powered and use a liquid solution, often referred to as “e-juice” or “vape juice,” that is heated to create the vapor. The e-juice typically contains a mixture of propylene glycol, vegetable glycerin, flavoring, and nicotine, although nicotine-free e-juice is also available. The flavorings can range from fruity and sweet to savory and spicy.