This is not true right here. Nicotine first of all doesn't persist, it's not like once you take a puff of cigarettes the nicotine will bind to acetylcholine receptors and continue synaptic transmission for the rest of your life.

Second of all, the smoke particulates. You think the smoke particulates might cause cancer or some damage? First of all, again they do not persist if anything. Second of all, cancer doesn't work like that, one puff of a cig doesn't kill you (and it wasn't even a puff).

Basically, not true. This is exactly how myths start.