The concept of the electronic cigarette has not changed very much since they were first invented. There are however many different models and many different brands. Keep in mind, the concept remains the same for all makes and models and brands. Every proper electronic cigarette essentially does the same exact thing. They all vaporize a liquid (usually glycerin based) and allow the user to inhale it. Many deliver flavor and in nicotine.

Two main types

There are two main electronic cigarette types: