if you just google cigarettes and additives you will see the list of 499 chemicals added to cigarettes by manufacturers. There is no way a PV has anywhere close to that much crap in them. Then you see from those 499 additives when you light it up you get the rest of the 4000 chemicals/carcinogens from the reaction. Even if PV's turn out to have some sort of carcinogen there is no logical way it would surpass or even come close to rivaling that of an analog.