Inhaling second-hand smoke is an entirely different mechanism of exposure than just witnessing something. I loved the smell and effect of my grandmother's Marlboro Reds, and I loved the smell and effect of my father's Golden Virginia tobacco. I'd shut the windows as a kid and teen and hotbox the room so I got some, and sure enough, I ended up smoking for many years.

https://www.nih.gov/news-events/nih-research-matters/how-sec...