You know I have to bring this out, but it's not because you choose to ignore it
I don't think that anyone is going to argue that nicotine isn't addictive. The real question is: how addictive is it?
Can I suggest a little experiment? For those that have been off analogs for a year or more, can you go more than 2 hours without vaping, and not get the jitters? How hard/easy was it? (Should we start another thread for this?)
Well... not so much "ignore" as "not go off on long tangent that's not going to be settled any time soon".
Also, nicotine's addictive level is not some set thing. There are "social smokers" who don't seem to crave it much or at all. There are people that can pick up or walk away from cigarettes. Smoke when they drink but only then. Others who quit "cold turkey" without much withdrawal at all.
Me? It would be better to lock me away and let me "detox" if you want "cold turkey". I became utterly impossible to live with the times I attempted "cold turkey". I can even recall, disturbingly enough, periods when I was young and broke, feeling pretty strong impulses to steal to get money for cigs. I didn't but it rattled me to find that kind of thinking in myself.
I feel the same strength of reactions about vaping. The idea of somebody trying to take it away makes me angry. I mean just thinking about it. I get angry. Right now. I'm serious. Nobody is even suggesting it and I'm here, vaping away but there it is. Just the thought causes the reaction.
I suspect for various and sundry mine is a fairly straightforward (and powerful) addiction to nicotine. But it gets complicated fast. I'm not necessarily representative of... anybody. My transition was rather simple. And had few side effects. Which is one reason I suspect I'm more "textbook" nicotine addicted and that's the bulk of it. Others... there are so many chemicals involved... who could untangle all that?
But.
If the primary addictive component is not nicotine, vaping shouldn't work.
That is, people who tried to "switch" would experience powerful, deeply unpleasant withdrawal and would likely go back to smoking. The failure rate of "cessation" products and techniques is in 90% territory. The NRT that seems to be working to any significant degree involves switching the delivery system for the nicotine (gum, patches, inhalers, etc.).
I know it's more complex than "just nicotine" but if nicotine isn't the primary addiction, switching delivery systems wouldn't work well. Or at all really. Vaping wouldn't be growing the way it is. Smokers wouldn't be adopting it in droves. It would have been a curiosity that had a moment of interest then fallen by the wayside.
I'm a little (often very) disturbed at those who play down nicotine's addictive aspects. For one, that's highly variable among individuals. I'm a heavy coffee drinker. I like it. But if I get up in the morning and find I forgot to buy some and I'm out? I grumble at myself and put it on the grocery list. That's it. I have zero addiction to caffeine. In fact, it doesn't affect me much. It's largely useless as a "stimulant". Unless I consume unhealthy amounts. I go through a pot of regular strength coffee and it flat does not wake me up. I can't tell the difference between the mornings I have coffee and those times I forgot to buy some and am out. I seem to wake up at the same rate.
(Which is, with my metabolism, in a word: slowly)
Other people are intolerable until they've had their coffee. Much like I am without my nicotine.
So it's even more complicated than just "how addictive is nicotine". It's "how addictive is nicotine for person X". Because the answer isn't going to be the same for everybody.
But notice nobody ever tried a "nicotine free cigarette". In fact, the tobacco industry did everything they could to find ways to enhance the addictiveness of the nicotine and to "spike" nicotine content. At it's most simplistic level, it's the nicotine. From there, it gets complex enough we could talk about it for days. Weeks. Years even.
Addiction is complex. Like humans. If it were simple, we'd fixed it already.