1. No tar and other carcinogenic substances.

2. Harmless to others and  the environment.

3. No danger of second-hand smoking.

4. Can smoke in everywherre even though public places.

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

6.No ignition and  fire hazard.   

7. Save smoking cost 80% per year.

8. Give up smoking in 3 months if need