My husband is 60 years old. Excercises daily and maybe 30 pounds overweight. Has labored breathing with just small tasks. Takes no medication. Has had stress test and lung X-ray a year ago with negative results. Seems to become worse now with dry cough involved. Father died of lung cancer at 57 but was a smoker. My husband is not a smoker. We are both concerned as condition seems worse than a year ago. What do you think?