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E- Cigarettes contains nicotine. They claim that the vapours and the smoke is tar free, so is harmless.
However, it is difficult to comment at present that what side effects one will get after using e-Cigarettes. We can't comment this at this time because these cigarettes have been introduced recently.
The side effects would be evident after few years only.
Conventional Cigarettes don't contain Propylene Glycol. This solvent is added to make fumes.
Again, the side effects would be evident after few years only. So, we strongly discourage, use of any conventional cigarettes or e-cigarettes.
I hope it helps.
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