An e-cigarette is a small, battery-driven electrical appliance. In contrast to classical cigarettes, it does not burn any tobacco, but rather electrically heats a fluid (known as “e-liquid”), causing it to give off steam. This is why electronic cigarettes are often also referred to as “e-hookahs” or “vapes” (because they “vaporise” the liquid). There are both disposable and reusable e-cigarettes.