I don't know about the studies(waste of time and money) but as somebody that has ridden a bicycle everyday for the last 35 years,I can assure you,everything works fine and I'm no spring chicken.

Smoking will kill you too,it killed my grandmother at 106 and my mother at 98.
Just think how long they would have lived if they didn't smoke.....LOL!
I'm not saying smoking is good but there are ALOT of other factors involved.

I think living in L.A. is more dangerous to your health than smoking.

The world needs more studies......