@windwalker Terri, it is very possible. I used to cough a lot and had to carry water wherever I went. Then I went through months of allergy shots and the coughing subsided significantly to barely noticeable. The interesting thing is that it didn't come back when I was diagnosed with MAC 5 years ago. But it came back earlier this year and has reached a level almost the same as I had years before. I don't know what is going on. The only thing I know is that I feel very healthy still and nothing else has changed for me physically. I have an followup appointment with my pulmonologist in December. If there is no change in my lung condition by then, I'll be happy to just live with it because I know that the allergy shot treatment must have worn off by now and there is not much I can do about it.