Firstly, Vaping is not smoking. Vaping utilizes a Propylene Glycol, Vegetable Glycerin based liquid, mixed with small amounts of nicotine which is optional and food grade flavouring.
This gets vaporized in a battery powered atomizer, simulating the experience of smoking without any of the tar, carcinogens or added chemicals that are found in tobacco cigarettes.
The Facts
The History
The Device
What's in Your E-Juice?