@nla4625- This is a great question, Can you reverse lung damage? Please keep in mind that I am not a biologist or science person at all. I'm a patient just as you are.
The thought used to be that lungs couldn't regenerate, but that has since been disproven unless there is permanent damage where cells have been killed.

After my first and second lung lobectomies, my other lobes seemed to fill in the spaces left by their removal. New alveoli also seem to grow. But we can not, at this point regenerate lungs like an octopus can of one of its limbs.

After the lungs are damaged the irritant (s) need to stop so that any non-permanent swelling can subside. When I'm even a little overweight I feel my lungs strain. I feel more sluggish and tired. I know for a fact that you can feel so much better with weight loss, exercising, walking, and eating cleanly can make a big difference in how you breathe. How you feel will also depend on how much damage was done and how much cells regrew. I wish that I could be more specific but this site is certainly a good one. Thank you for sharing it.

I'm also 74 and can feel so much younger when I'm at my best. When do you plan to start feeling better?