Just a quick one really to all you medical bods. Six weeks ago I quit smoking using nicotine gum and so far so good even if it is hard work, I was fine until about two weeks ago, now whenever I do any exercise my lungs are hanging out. I'm not pushing any harder or running any faster but it feels like my lungs have never exercised before and I'm trashing them in cold air! Why is this? I thought that quiting smoking would help my lungs and fitness not make them feel worse!