I don't really cough either. I have to work at it. I was told early on that I must cough. This disease used to be called Lady Windmere's disease. You can read about that - but it has to do with not coughing, not clearing the mucus from the airways. You should immediately get an aerobika device. This is a device that will help you cough. Just follow the directions for using the aerobika. I order mine online and it's a good idea to buy like three at a time. You will use it a few times a day. I think sleeping elevated also helps to make coughing possible. I noticed it's the morning when I can most easily cough and actually clear my airways. I still can't really do sputum samples. My pathology comes directly from my lungs during bronchoscopy. Taking Mucinex daily helps along with NAC Supplements from the health Food store. The more you cough the more you will get the hang of coughing and clearing the airways. Not coughing and not clearing the airways is a problem.