I quit smoking after 30 years and developed asthma to which the Dr. said was quite common. I had been completely healthy up to that point in my life and then I was left homebound and on several puffers. After 1 1/2 years I started smoking again and am off all medication. Do I want to smoke? No. Do I feel better. Oh yeah.
I found your post most interesting,especially the part where the doctor said that your situation was not uncommon.
I was a severely asthmatic child and started smoking at 17,the asthma left 3 years later,never to return.I am now 73 and still smoke.
Teddy Roosevelt's asthma was treated by smoking cigars and he had the best doctors in NY.
We have less smoking today and more asthma.
It's a mystery to me.