I think alot of vapers start with dual use and transition to full time vaping over a period of years. Yes, there are those examples of smokers who pick up vaping and never go back, but I think a much larger number try an ecig, go back to smoking, try again then go back to smoking, etc., etc.. My term for this behavior is comparative nicotine use: they are comparing vaping to smoking. My personal belief, and experience, is that if this goes on long enough vaping wins out over smoking. So when I see a number like 87%, in regards to vaping failure, my feeling is the true failure is in interpreting what is actually happening in the real world. There is a battle going on in peoples' lives, with the objective being to be able to breathe better, to be healthier, to get out from under cigarettes. It's messy; it's not linear; it defys neat little conclusions drawn from incomplete data, by people who have the very vaguest notion of what that's like to experience because they haven't and may very well, indeed do as we all surely know by now, have their own axe to grind. Vaping is stickier than it appears to be imo. It's just not happening in a way that plugs into the way ignorant people are thinking about it. We need more researchers who actually, yanno, vape. And it wouldn't hurt if they weren't quite so aghast at all the various addictions humans are prone to. It happens. Get over it.