Nicotine is depending on how you measure the 3rd or 4th most addictive substance on the planet. It's up there with Heroine, Fentanyl, Cocaine, and Meth.
If you consider heroine a "not even once" type of drug then nicotine should give you pause.
What dimension of “addictive” are you anchoring on? Capture rate? Withdrawal severity? Reinforcement strength? Relapse rate after quitting? Nicotine dominates on some of those and not others.
Pretty clear from the responses to OP that most people are quite unaware there is almost two decades of decent research on pure nicotine now, and that, outside of vaping (where hard evidence is mostly lacking, due to the novelty), the purer stuff probably really isn't all that addictive, in the grand scheme of things. In many cases it is hard to even say it is much different than caffeine.
It's a reasonable mistake, I'd say. We spent those decades conflating "nicotine" with "smoking" and, through herculean efforts, managed to get the smoking rate down to 12-14% (in Germany it's still 22.7%!). Now, tobacco companies have come through with genuinely less harmful, genuinely less addictive products, but because of their previous wild duplicity, nobody really "believes" it. They think that nicotine must cause cancer. "Fool me once," for sure.
Can you point to said research because everything I can find from any kind of authoritative source is that form doesn't matter and nicotine is strongly addictive in all of them.
There is like zero messaging out there from anything resembling a health organization that says, "nicotine in purer forms is okay actually." It's an extraordinary claim that nicotine is super addictive only when mixed with other stuff and if you get the pure concentrated drug that actually lessens its pharmacological effects.
The delivery system modulates speed and magnitude of the hit, which affects how rapidly and how strongly dependence forms, but every form produces dependence with sustained use.
There isn’t anyone who is going to say “nicotine in purer forms is okay actually” because there isn’t anyone who is tasked with answering such a broad question.
Also, be careful not to shift the frame. Spivak ranked nicotine with other drugs. You changed the framing to “all are highly addictive.” These are different assertions, and both can be true at the same time. That’s why it’s more important and more interesting to discuss it in terms of addiction subtypes
If you consider heroine a "not even once" type of drug then nicotine should give you pause.