So? I was one of those kids. Lungs clean as a whistle. I see my neighbors pull up to the curb and open the doors, and waves of profanity roll out--and the car is packed with kids. I'd rather raise my kid on secondhand smoke than secondhand vulgarity.
Anybody who smokes in such close proximity to their children, doesn't care about their kids health. You can't wait for 20 darn minutes till you're out of the car to smoke? Give me a break, smokers. That nasty habit killed my husbands mother. Also, my parents smoked until I was about 9 and up until they quit we were sick all the time.
My old man did both, regularly, and I turned out OK, by most accounts.