I am 100% opposed to smoking in cars, mostly because I find it sickening, even years after the smokers have left the car.
However I am also disgusted by people trying to address minor safety considerations by illegalizing behavior in a misguided and impossible attempt to control all risk factors.
If your population is so &%#$@ stupid and irresponsible that they’re crashing and not wearing seatbelts etc in significant numbers, then making entire activities illegal and punishable by being detected, intercepted and fined by police seems to me like it’s going to be both ineffective and a terribly wrong-minded kind of approach to use.
It seems to me the main problem in the USA is maleducation and backwards authoritarian thinking. Arrghh!