It’s not that people stopped but that they didn’t start. Smoking was no longer sold as cool so kids didn’t learn of it as a cool thing.

Kids and even adults pick up cues from games, movies, books. War is like CoD and heroic war movies (why do many 18 year olds go to the army expecting glory and come back with trauma and broken dreams?), sex is like in porn, and gangs are like in GTA. Until they gain practical experience and slowly realize some things are vastly different. Maybe a couple will love “porn sex”. Most others will break a leg having shower sex and reconsider the “teachings”.