1. Electronic Cigarette have no tar and other carcinogenic substance or harmful ingredients to human body. 2. Electronic Cigarette have no ignition required, without the danger hence will not lead to the over 4000 chemical substance produced by the ordinary cigarettes, like carbon monoxide. 3. Electronic Cigarette is harmless to other and the environment, without the danger of second-hand smoking. 4. Electronic Cigarette has no possibility to cause fire. It can be used safely in most No-smoking places. 5. According to the smoke-quitting procedure, the target of quitting smoke can be reached no pain-fully within a certain period of time