I think it's slightly disingenuous to suggest that nicotine is not addictive, simply because there have been no studies in which people are deliberately exposed to it to see if they become addicted. Such a study would be deeply unethical, and I don't believe there has been one where people were injected with heroin to see if they developed a habit either.
The fact that we are able to comfortably replace smoking with vaping implies that our addiction is still being catered to. No-one in their right mind I think, could argue that smoking is not addictive. There has been a lot of incidence of ex smokers becoming addicted to NRT instead of smoking, and I think a lot of us would find it very difficult to stop vaping, whether we want to believe that or not.
I do think it's highly likely that vaping is less addictive than smoking, because tobacco contains other addictive substances such as MAOIs, but not addictive at all? Not buying it. The first thing I reach for in the morning is a vape before I make the coffee, and I know very well when I haven't had one for a few hours, and the feeling when I do later is just like the first fag after not smoking for hours.
I'm certainly addicted, not that it's in any way a problem if it's not damaging my health. I'm addicted to caffeine as well, and don't have a problem with that either.