This was quite a surprise to me as I had quit smoking 45 years ago. Have been an avid tennis player for over 40 years, and within the past year have found it difficult to play more than one set. Tennis has always been my exercise. Cannot tell you how shocked I was when I received the news that I only had 66% of lung function. The Doctor said I should come back in six months. Then the appointment was postponed twice. Now I have an appointment with a new Doctor and hope he/she can provide me with some options on how to deal with this. Surely there is something we can do be it breathing exercises, or what I do not know. Thanks for any comment on how to handle this problem. Take care . . .