Advantage functions:

1. No tar and other carcinogenic substance.

2. Harmless to other and the environment.

3. No danger of second-hand smoking.

4. Smoke in a public place.

5. Enable smokers to abstain from smoking non-painfully.

6. Give up smoking in 3 month if you want.

7. Save the smoking cost 80% each year.

8. No ignition and no fire hazard.