Great post zanedog! Let's have a look at your points.
I don't totally agree with what is said in Rolygates post. Sure, most of the human studies were done on smokers, however, smoking is the main delivery method for the drug. There have been animal studies where the nicotine is delivered without smoking, addictive characteristics have been verified.
I've read about animal studies before but I have never seen data from them that suggests nicotine is significantly addictive. It may well verify addictive characteristics, but without quantifying that it doesn't mean much to me.
I pulled this animal study link from the set of links later in your post:
Characterization of spontaneous and pre... [J Pharmacol Exp Ther. 2003] - PubMed - NCBI
"The effect was dose-dependent in all measures with no significant changes at the lowest dose of nicotine (6 mg/kg/day)".
So no indication of nicotine withdrawal in mice after that dose of nicotine daily via subcutaneous minipumps. I weigh 100 kg so that dose for me would be 600 mg per day of nicotine intake. Using 24 mg/ml juice I would have to vape 25 ml a day and I suspect it would likely be closer to 50 ml to get close to the same amount of blood nicotine levels because I'm not injecting it. The average ECF vaper vapes around 4 ml a day as do I.
They say that at higher doses they found indications of nicotine withdrawal. How high were those doses? If it was at 12 mg/kg/day, then I would have to vape 100 ml a day to get close to that. I'm vaping only 4% of that quantity at half the nicotine, so 2% of the nicotine.
I know it's more complicated than that, but this does seem to support that there is no addictive effect from vaping nicotine.
From that article (paragraph 7):
"Nicotine is the drug in tobacco that leads to compulsive drug seeking or addiction. However, several lines of epidemiologic and laboratory evidence presented in this chapter indicate that tobacco-delivered nicotine is substantially more addictive than are pure nicotine forms. Other tobacco constituents, delivery methods, and processes may play a critical supporting role."
This is a small quote from a much larger article, but I believe it is crucial to making sense of it for our purposes with vaping.
I know what it's like for me to be addicted to smoking. To trying to quantify it, I'll use a scale of difficulty in quitting from zero to 10, where 10 is 'can't do it' and 0 is 'no effort required'.
I said before in this thread that I smoked for 37 years, switched to vaping, weaned myself off vaping nicotine, went back to vaping nicotine and them off it again. Before I managed to quit smoking I tried doing it cold turkey, weaning down slowly, not smoking until noon, the patch, gum and a couple of combinations of them.
On that scale quitting smoking without vaping was a 10. Switching to vaping was about a 5 on average with cigarette pangs that I used to chain vape though coming in at about 8. Weaning off nicotine the first time was about 2 to 3, but the cigarette addiction was still in the picture. By the time I tried vaping nicotine again, I had been smoke free for 17 months and there was no cigarette addiction in the picture at all. The effort required to give that up after a month of use I estimate at 1. There was a small 'pull' involved, but I don't consider that addiction. I appreciate the TH that nicotine gives my vape and that may be all it was. I gave up caffeine years ago and I would say that was harder to do, specially the first one in the morning

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So when the researcher does work on smoking addiction and says what I quoted from the article above, I think 'OK, that's why I didn't find vaping nicotine to be meaningfully addictive'. It also for me helps support the conclusion I came to from the animal study.
and many more links below. There is really not much debate in the scientific community, the peer reviewed papers are numerous. Yes, they indicate that tobacco increases the addictiveness of the nicotine, however, that does not negate the basic premise, that yes, nicotine is an addictive substance.
https://tobacco.ucsf.edu/content/featured-study-understanding-nicotine-addiction
~~~ Moved this link up ~~~
Animal models of nicotine withdrawal: intra... [Methods Mol Biol. 2012] - PubMed - NCBI
Effects of nicotine in experimental anim... [Handb Exp Pharmacol. 2009] - PubMed - NCBI
Nicotine withdrawal traced to very specific group of brain cells
A Critique of Nicotine Addiction - Hanan Frenk, Bassam Tabbara, Reuven Dar, Abdallah Tabbara, Alberto Sangiovanni-Vincentelli - Google Books
Biological Research on Addiction: Comprehensive Addictive Behaviors and ... - Google Books
Studies Link Family of Genes to Nicotine Addiction | National Institute on Drug Abuse (NIDA)
Gene Linked to Early Nicotine Addiction
the volume of research indicating nicotine is an addictive substance, is huge. And again, yes, much of the human studies were done with smokers and ex smokers of course. Can Rolygate come up with any Peer Reviewed papers published in a reputable medical or scientific journal indicating nicotine is not addictive?
I read, skimmed, read and skimmed through those links.
I agree, smoking cigarettes is very addictive. I disagree that smoking addiction research correlates to nicotine addiction properties.
There is a lot there on animal research which is more of the same as what I discussed above. None of it indictaes to me that vaping nicotine is addictive.
I agree that not everyone will become addicted to smoking. I was extremely addicted to it so I am one of those people that it really affects. A lot of people are like me in this. I found vaping it not addictive.
edit:
As far as the human nonsmoker testing some people are looking for, I do belief the ethics behind that are not going to allow it to be done.
Human testing has I believe been done for nicotine use as a drug to treat certain medical conditions like crones and ADD's. AFAIK, no addiction was found. If I find a link later I'll post it.
~~~ snip ~~~
rant over, just hate reading such a silly thing like nicotine isn't an addictive substance, in a forum that is called the library here, that no one can even respond too! New members are going to look at that post and put their trust into it.
Our understanding of science changes as more knowledge is accumulated. Sometimes the prevailing knowledge is simply incorrect. Galileo probably had a bit to say about this topic

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I know I'm just some guy on the internet that disagrees with a whole body of evidence about nicotine addiction. I feel I'm being logical. I am also open to evidence that I'm wrong and will change my mind if that happens. Until that happens I will continue to believe what makes sense to me, as I'm sure you will also
Let's not continue to take this thread OT. I would be happy to continue discussing this in PM if you wish.
Vape on.