@jetpilotg4 are your symptoms only present while skiing? Or is it any exercise based exertion? While I can’t speak for skiing with COPD I do have Cystic Fibrosis and my lung function is in the low 40’s. I am huffing and puffing and coughing quite a bit at the end of each pass, however, I know that skiing is great for my lungs. The skiing helps to open them up, and allows me to take deeper breaths. I would say that continuing to ski won’t hurt you but can only help you.