However bad it is,.. You have to respect their wishes,..
You can try to talk sense to them, give them dirty looks, but you cannot force them.
Otherwise, you end up in a system with no freedom to raise your own children as you see fit.
There are lots of parents who are not fit to raise their own children.
That's why there are so many cases of child abuse of other forms (e.g. forcing drugs, as well as physical, mental and sexual assault), and one of the reasons why the state can take your children away to adoptive or foster care.
State care isn't great. But for some children it's better than living with their parents.
There's a debate as to whether smoking is serious enough to warrant such action. But there is no debate that parents should be able to do what they want to their children - or that we can never do anything more than raise an eyebrow and whisper as they go past.
And any adult in America who smokes whilst their children are in their car are wilfully and negligently committing abuse on that child, because no adult in America is under any illusions that smoking is not bad for them or their children.
Killing yourself for a nicotine fix is stupid, but ultimately your right to choose. But killing your children for a nicotine fix is selfish and cruel, and you are taking away your children's right to choose to live a healthy life by doing it.
Surely as someone who believes that laws should be there to protect your rights against those who would take them away can see that?