Same here. But I guess it's something like: "We don't wan't children or teens see adults smoke on screen today, giving them unhealty ideas". Which is fine, since cigarettes is an old super corporate deadly thing which simply shortens peoples lives.
I'm glad people are smoking less nowadays and with modern regulations, for the least just remembering the old days in the 80s/90s when you had to wash all your clothes after a night out at a pub or a night club, despite being a non smoker. Just because of all that frakking stinking cigarette-smoke that got into all your clothes back then. But that was normal back then, and one of a gazillions stories about smoking that would freak out yonger people today.
But I still kinda miss people smoking in noir-like movies, just for the nostalgic atmosphere. Also some classic female movie stars looked so gorgeous, fabolous and elegant smoking back then. Yeah, of course that's a severe morally contradiction lol.