interesting thread. I can't comment since I am not sure if I suffer from it still but I know I did when I was younger. I stopped smoking about 2 months back after 10 years and my lung capacity has improved (i think) from what I can feel when going strong on the bike. I still feel like I need more air but I think it is because my lungs haven't expanded / developed to the point they can inhale as much air as they need. When I can't breathe in what I need I get super dizzy and sometimes come close to passing out.