"Because rats showed a significantly higher willingness to go the distance to get a taste of rolling tobacco smoke, the authors concluded that a substance other than nicotine must be getting them hooked.
“[N]on-nicotinic components have a role in tobacco dependence and…some tobacco products have higher abuse liability, irrespective of nicotine levels,” the study authors concluded."
Close, but no cigar

I don't know about lab rats, but it's the smoke
itself, not necessarily any non-nicotinic components. If it's only the 'hand to mouth' action then any 'plastic cigarette' would work. It's the environmental smoke/vapor, which patches or gum don't provide, but ecigs do. Even ecigs that don't produce much vapor don't work.
I've posted this before but it's relevant here:
"Sherlock Holmes sat silent for a few minutes with his finger tips still pressed together, his legs stretched out in front of him and his gaze directed upwards to the ceiling. Then he took down from the rack the old and oily clay pipe , which was to him as a counselor, and, having it, he leaned back in his chair, with the thick blue cloud-wreaths spinning up from him, and a look of infinite languor in his face."
Holmes again, to Watson:
"It is quite a three pipe problem, and I beg that you won't speak to me for fifty minutes."
Or, we can remember the case in which Holmes needed a pound of the strongest shag tobacco to resolve the problem and stayed alone all the day smoking, and Watson found him in a sort of trance, in a room that "was so filled with the smoke that the light of the lamp upon the table was blurred by it and my first impression as I opened the door was that a fire has broken out".
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Scientists want to find non-nicotinic component, it's their job! ... but they may be missing the forest for the trees.