No, they have no choice but the parent who is a smoker chooses to put his children at risk for his own selfish needs. At least with heat there is a trade off for the child. With tobacco there is no trade off. Only risk for the child and no potential benefit.
Or a family that over-indulges their kids' desire for junk food.
Again the child is making his own choices. This isn't equivalent to the parent forcing the child to breath smoke. Such a parent isn't fit.
\ Or are you of the opinion that cigarette smoke contains some special,EE-VIL, ingredients that must be stamped out by any means necessary?
No. I am of the opinion that a small percentage of people might be the victims of extreme damage from SHS, and until it can be proven without a doubt that exposure to SHs is completely harmless in all cases any parent how forces his child to breath SHS is not fit to be a parent.