Agree with what was said earlier in this thread (I think by skoony) that the connotation of "addiction" feeds adversaries in a way that makes for lack of compassion and arrogant righteousness. I'm usually like, "why is my use of this (or even addition) of concern to you?"
Part of addiction, around half of it, is the reward aspect. If that wasn't there, and person still craved the substance or activity, it would be very visible problem. Add in the reward aspect, and it is challenging to throw stones when one is living in their own glass house. I've known / lived with workaholics. Yet, we live in a society whre hard work is celebrated or praised. And only if that person is in a relationship with another who is constantly wondering or saying, "when are you going to spend some time with me?" do we even consider it a problem. Clearly we reward workaholics, and justify the reward as good and necessary.
With nicotine the reward is any of the following: stress / anxiety reduction, focus, relaxation, and possibly more. A nic user that has used the substance for more than 7 days realizes it can help in many ways, but like everything else (that has ever existed in the physical world), it has side effects, or downsides. Yet, I would say it is very rare that those downsides impact anyone else, unless the nic user is deprived of any opportunity to use nic and is put in a situation that is not very relaxing and focus / concentration is deemed highly beneficial. Even then, if the nic user knows that it is a matter of minutes or at most a few hours, chances are they'll be fine in that situation without nic.
Though, I'm not aware of any other substance or activity (other than work) where the user is constantly engaged with the item. Other drugs have a 'crash' that prevents the user from partaking in those moments. That a nic user can go hours without partaking, kinda sorta shows that the addiction while thought to be high, is able to be done in moderation every single day that one considers themselves a user.
As one who has been able to achieve a consistent state of moderate smoking, while having history of being highly addicted as well as going cold turkey, I don't know if I can even call smoking 'highly addictive.' And with vaping, if all flavors were removed from all eLiquids, I don't think vaping would be anywhere near as popular or in mass use, as it is currently. Even as dual user, if I have choice between great wonderful smoke (that I know I'll enjoy) or new flavor of eLiquid that I'm wowed by, I will choose the flavored eLiquid virtually all the time. If choice was between unflavored or flavor I'm just okay with, I'll probably choose the eLiquid about 80 to 95% of the time.
From all I've seen on vaping forums, I think if vaping were literally regulated out of existence, that the vast majority of vapers (who are ex-smokers) would not go back to smoking. I know for sure some would, but I don't think most would. Fortunately, there will never be a way to prove this hypothesis one way or another, but I do think most vapers could cut back or cut down on nic, rather easily. But, I would wonder why? What problems is vaping causing in your life that the need to cut it out was so great?