I was told a story 30 years ago.
Scandinavian Caravelle lining up for takeoff. I can't remember the outside weather, but as thrust changes were made white vapour started to descend from the cabin ceiling.
It became quite thick, but, as we all know what is was (frost from aircon) there was no hot smell.
But in the dimmed cabin it looked like smoke.
Pax at the overwing had the hatches open just as PF was about to launch.
Fortunately the sharp cabin crew managed to alert the captain to STOP.
Ouch.