Why are some people so resistant to the idea that nicotine by itself is not as addictive as everyone thought it was?
Because years of actual science does not support that idea .. and, because the idea smacks of the same propaganda that launched the cigarette originally .. and, it sounds like we are trying to support our habit with flawed logic .. and, as you said, it's anecdotal evidence .. and your friend WIKI says ... "The expression anecdotal evidence refers to evidence that may be true but cherry-picked or otherwise unrepresentative of typical cases.
Also, anecdotal evidence can be inaccurate, sometimes based on anecdotes, second-hand accounts of events or hearsay.
I admit I am addicted to the nic .. if not for the PV, I'd still be lighting up ..