Let’s be clear on the physics of vaping...there is no fire involved, no burning materials...a liquid is boiled by a metal coil(a twisted wire). The wire is heated via connection to a battery. The wire is surrounded by a wicking material(often cotton) that is soaked with e-liquid(a solution usually containing vegetable glycerin, propylene glycol, flavoring, and nicotine). When power is engaged, the coil heats up, the surrounding liquid soaked wicking material produces a flavored steam...not smoke.(unless you run it dry)
Interesting! I did not know that!