That was an impassioned OP, but with not a single cite or reference, I don't find it persuasive at all. (Except the part about BT manipulating nic levels in cigarettes to make them more addictive, which is certainly true.) John Phoenix, you make a whole lot of claims and definitive statements in your post - do you have reputable cites for each one of them? You say you "sited" scientists, but you didn't. A cite is a link or reference to a peer-reviewed study, paper or analysis that proves, or at least indicates, that the writer isn't pulling facts out of thin air, or making them up.
Pure nicotine isn't a benign substance. It's so toxic to mammals that its use as an insecticide has been banned in several countries, including the USA. ml for ml, it is more toxic than ........ It's a very potent poison and affects most systems of the body. One of my 30 ml juice bottles, were I to drink it, may well kill me. It's a very potent chemical - and interestingly enough, although toxic, also has some beneficial phamacological uses. (Each of the preceding statements is cited in the link below.)
I did a little googling around and the easiest link I have for a cite is wikipedia - which might not always be 100% accurate but always has a long list of cites at the bottom of each article so readers can reference and follow links and learn more.
Nicotine - Wikipedia, the free encyclopedia
Now, do I believe vaping is less harmful than smoking? HECK yes! My own purely anecdotal (and thus scientifically invalid LOL) experience tells me this alone - I am breathing better, smelling better, and not coughing at all now! I'm not drawing smoke laden with burning nicotine plus countless added chemicals into my body several hundred times per day. I LOVE vaping. But I'm not fooling myself that it's 100% benign...drawing anything but clean air into one's lungs probably isn't optimal, health-wise.
BTW - for 37 years, I've hand-rolled my cigarettes using imported European/Turkish shag tobacco blends, which to the best of my knowledge contain few if any additives. I think a little VG to keep them moist in some brands - I smoked mostly Bali Shag or Drum. No filters, and I use French cigarette papers, which have no saltpeter added (this keeps tailor-made cigarettes burning; RYO smokes frequently go out because the papers aren't impregnated with stuff....I think that changed recently when the FDA made manufacturers of tailor-mades add something to make them go out to be less of a fire hazard) so in terms of smoking, I was a pretty "clean" smoker. All my non-smoking friends over the years have told me I didn't really smell like a smoker; I think because of what I smoked. But on a 1-10 scale of addictedness, I was (am) about a 20.
tl;dr: Vaping is fantastic and almost certainly much less harmful than smoking. But nicotine is not a benign substance.