Long lungs can be due to hyper-inflation. Hyper-inflated lungs can occur due to chronic obstructive lung disorder such as asthma, emphysema or cystic fibrosis. Since you have only 10 breaths per minute, you should consult a lung specialist. You will need pulmonary function tests. Since you gave up smoking long ago, chances are that the disease—asthma or emphysema is in a stable stage. However, you may still require treatment. Please discuss with your doctor. Take care!
The medical advice given should not be considered a substitute for medical care provided by a doctor who can examine you. The advice may not be completely correct for you as the doctor cannot examine you and does not know your complete medical history. Hence this reply to your post should only be considered as a guiding line and you must consult your doctor at the earliest for your medical problem.
Thank you. Though the tech commented on my long lungs, there ended up being no mention of it in the radiologist report. My chest xray was normal. Since I have no problems with exercise, I'm going to let this one go.