Vapes themselves do not contain calories, as they do not have significant nutritional content. The liquid inside e-cigarettes or vape devices, known as e-juice or vape juice, typically contains nicotine, flavorings, and a base made up of propylene glycol (PG), vegetable glycerin (VG), and sometimes water. These ingredients are generally calorie-free or have negligible calories, especially in comparison to food or drinks. However, certain flavorings or sweeteners used in vape juices may contain trace amounts of calories, but these amounts are so minimal that they don’t have any significant impact on one's daily caloric intake. In essence, vaping is not a calorie source like consuming food or beverages. To learn more, you can read do vapes have calories?