E-cigarette is a common term for “electronic nicotine delivery systems (ENDS).” Other terms used include vaping devices, electronic cigarettes, electronic vapor products (EVPs), vape pens, e-cigars, e-hookah, etc.
The act of using these devices also has several descriptors; including vaping, Juuling, etc.
Sizes and shapes of e-cigarettes vary (e.g., shaped like cigarettes, pens, flashlights, flash drives, etc).
The device heats a liquid to produce an aerosolized vapor which is inhaled.
The liquids used may be called e-juice, e-liquid, etc. Other substances used include wax, salts, and herbs.
E-cigarettes can be “open” and refilled. Others are “closed,” using disposable cartridges, pods, mod pods, etc.