I am 40, I smoke approx 3 a day, I recently have had a feeling that I can t get a fully breath, but have had this in the past, I also have chest discomfort, my doctor did an ecg, heart echo which were normal, my chest X-ray showed slightly enlarged lungs, but no damage!!! he has arranged for a lung function test, my mother and aunt have copd, what my chances of not having copd??