Before I quit smoking I was quite active, walking, swimming and a bit of cycling. It was mainly my health that made me have a go at stopping. I was starting to wheeze when I breathed out and was getting short of breathe when I exerted myself. In the first few weeks my breathing improved, the wheezing went and I didn't get as breathless. I'm in my 10th week and it's all come back but it seems worse. I'm wheezing again and getting breathless even walking up the stairs. I'm also coughing up yuk especially after exercise. Is this normal after quiting? I did expect the coughing up the yuk bit but I'm worried about the breathlessness. Should I go and see the doc?