[Devilinbaggypants]

I've never seen any thing that unequivocally verifies that. It's like trying to say that second hand cigarette smoke is just as or more dangerous than smoking a cigarette yourself which from a common sense point of view is bs...just like global warming...it's a hoax put on by the smoking nazis...IMHO opinion of course ;-)

[gracesdad]

“I’ve never seen any thing that unequivocally verifies that.”

Unequivocal? Little is. But it’s just common sense that breathing in crap is not good for your health. I don’t need unequivocal health studies for that. Why do you think so many athletes are avoiding the Beijing air for as long as they can?