I can only answer for myself.If it is unlikely for nic to be addictive why are (at least the online communities of) vapers panicking and stockpiling liters/gallons of it? A non-addictive substance is something you can easily do without but there has been thread after thread of how and what to stockpile, nic being at the very top of the list. If it is not addictive I don't believe we would be seeing people panicking and stockpiling nic (DIYers and non-DIYers) or stating they are afraid (or would) go back to smoking. Every vaper could drop to 0mg nic with no issues, vape non-nic eliquids and be fine to keep vaping instead of smoking.
I know for a fact that I am not addicted to nicotine in any way at this time.
But I continue to use it because of what I see as very important health benefits.
It improves memory, concentration, and attention.
This is not disputed.
And it can very well help prevent Alzheimers and Parkinsons.
There is an ever-growing body of work that is leading to that conclusion.
Again, I can't speak for anyone else.
But since you quoted me, I'll reply in kind.