I think that it's a good idea. Because second-hand smoke is dangerous enough as it is, and to have small children in a closed in space like a car with the smoke is very harmful for them. And just opening the window will not help, because as children should be in the backseat, smoke can just blow right back on them. I see this law as protecting the innocent children that don't have a voice and can't protect themselves from the second-hand smoke of their parents.

__________________
I see your fantasy... you want to make it a reality

Are you in the mood to be subdued

You see these shackles
Baby I’m your slave
I’ll let you whip me if I misbehave

Tie me to the bedpost

I like it rough
cause I'd rather feel pain than nothing at all