When I was growing up, everyone smoked. The deacons at church went outside to smoke between Sunday School and the worship service. Doctors smoked... IN the examination room with their patients. Including my childhood doctor. Teachers smoked. There was a student smoking area at my Jr High and High schools.
Everybody frigging smoked, all the time. I guess it is no wonder I started at age 13... I've often said it was "in self-defense".
I remember riding in a Buick with my parents, two sisters and their husbands... all of them smoking. I was probably 6 or 7. It was cold, but I complained so much about the cloud of smoke in the car that they cracked the window a little for me, and I literally stuck my nose out of it trying to get a breath of fresh air. I didn't care that my nose was turning blue from the cold. It was suffocating in that car full of smoke.
I remember resenting that the adults would not listen to me, that they were choking me to death.
Well, that was then. We (collective we) knew smoking wasn't good for you, but we didn't know HOW bad it was, and there wasn't the societal anathema on it that exists today.
I'm kind of torn on the issue. On the one hand I don't like gov't intrusion into private property or child rearing in any but very serious matters. OTOH I remember being a little kid thinking I was going to choke riding in a closed car full of smoking adults.
Here's the thing: if it is one person smoking, with the window rolled down... that's one thing. Really, no big deal except for the anti-smoking fanatics.
Multiple smokers with the windows rolled up.... that's a miserable thing to inflict on anybody, especially kids who lack the ability to MAKE someone roll down the damn window.
So I dunno... exercising a little common sense courtesy would go a long way...