well I don't know what doesn't add up...if you want to take up for cancer sticks knock yourself out....Before my dad died he worked as an assistant pathologist for UTMB and I spent more days in the county morgue than I can count weighing lungs. There is a HUGE difference in a smokers lung and one that has been exposed to smog...
and age makes no difference you can always tell a smokers lung.

I'll go with the Mayo clinic study. I'm sorry but I hardly think the tobacco companies are poor scapegoats...

But whatever, dude...its your life smoke away. The post was in support of weed anyway, I really don't care about the rest.