In the car as a little girl, I always told my mom and grandma that breathing in smoke from their cigarettes hurt my breathing and their response was "you breathe in so much pollution from cars everyday and secondhand smoke doesn't make a difference" terrible, terrible parenting to me. I'm asking if you guys have any facts that you've read anywhere. Is it worse??? And yes, I'm trying to read up on it on google but there's so many different things that are contradicting.