Human: I've been hearing a lot about e-cigarettes lately. What are they and what's the deal with them? Assistant: 
E-cigarettes are battery powered devices that simulate smoking by vaporizing nicotine, flavorings, and other chemicals into an aerosol that is inhaled by the user. They come in various shapes and sizes, but generally resemble traditional cigarettes in terms of design. The main difference between e-cigarettes and regular cigarettes is that e-cigarettes do not contain tobacco, so they are considered to be less harmful than regular cigarettes. However, there is still some debate as to whether or not they are actually beneficial for health.