The Electronic Cigarette is a revolutionary appliance that simulates the functions of a cigarette without the harmful chemicals such as tar, carbon monoxide, arsenic found in real cigarettes. Electronic (or Electric, as its somtimes known) Cigarette uses a small replaceable cartridge filled with a small dose of nicotine and flavored propylene glycol liquid which is utilised and powered by a rechargeable battery.
When the user inhales on the appliance, the air flow is detected by a pneumatic airflow sensor switch. A microprocessor then activates an atomizer which injects little droplets of the liquid into the flowing air and vaporizes the liquid.

This means that Electronic cigarettes release no carcinogens at all because nothing is burned. The nicotine solution in the Electric cigarette is heated by the atomizer, which is activated by the rechargeable battery when you inhale. The smoke that is exhaled is really just water vapor. It is less harmful to others if it is harmful at all, than second hand smoke from regular cigarettes.
Although Electronic Cigarettes are not marketed as a smoking cessation device, and has not been medically proven to help users quit smoking, Electric Cigarettes can be used as an alternative to a real cigarette. They help fulfill a psychological needs of smoking, by allowing you to blow out smoke-like water vapor, gaining the same smoking satisfaction without the tar associated with tobacco products.