I have a friend who managed his asthma by smoking. Whenever he tried to give it up, his asthma would return and make life miserable for him.
LOL.
I do think we have more obesity now that fewer people smoke.
My sister does the same. I don't get it, but it works for her. If she quits for a few days, she goes back to turning blue again like we did when we were kids. She smokes seven or eight a day, and you'd never know she had asthma. What it is, the nicotine?