What is a smoke free electronic cigarette?

What is a smoke free electronic cigarette?

How it works is two-fold. Firstly you have the unit itself (vaporizer) and secondly you have the “fuel” for it, which is what you will hear called e juice or e liquid. Most of the e liquid you can buy is generally made from vegetable glycerin (made from animal fat and used amongst other things for asthma inhalers, as a food additive and rated as non-toxic for humans) and/or propylene glycol which is a synthetic alternative with a less viscous room temperature state, also classed as harmless to humans.