Hyperaeration in chest xray

Hello I am a 41 year old ex-smoker. I recently had a chest xray because I had been feeling fatigued after running (I run approx. 3.5 miles 3 x a week. I have also trained and run a marathon).
I received these results:
"The Lungs appear somewhat hyperaerated aerated, suggesting that there may be developing chronic obstructive pulmonary disease. There are no infiltrates or nodules"
I have made an appointment to have a consult with a specialist who will probably perform a PFT.
My question is this, Should I be overly concerned?
Should I stop Running?
Is this Degenerative?
Thank You