I’ll not smoke around children. It is rude. If the kids are here, I go into the garden for a smoke, rather than doing it inside.
But that is my choice, in my own home. Nothing at all to do with the government. Most parents/grandparents do that now as a matter of course, just in case. My daughter and son in law doesn’t smoke, so I naturally do not smoke in their home.
I have seen evidence that second hand smoke has an effect - usually on children with poor diets. Nothing that I would consider rock solid proof, but there is evidence, and, personally, I’d rather be safe than sorry.
Oddly, your post triggered an odd association in my mind. The whole thing about killing children’s immune systems by using antibacterials everywhere. That is something to ponder on for later, I guess.
Indeed, my Mom smoked around me in the car and the house all the time when I was growing up. In the car, she cracked the window, but nonetheless, I’m sure I had exposure there.
And here I am, without a hacking cough or lung cancer, apparently none the worse for wear.