The functionality of a cigarette or pipe is quite simple to understand. All you might want to do is light a cigarette and inhale the smoke it produces. However, a vape pen is considerably mysterious. Nevertheless, the way it works isn’t difficult either. The difference between these units and the traditional units is that they have a heating aspect instead of fire. Let’s find out more. Basically, when the tobacco, dry herb, oil or wax heats up, the chemical substances…