No smoking for me. I have asthma and other respiratory problems so my ability to breathe is significantly below normal. Unfortunately, I love to ski this time of year, so it is always a major medical event for me to go up into the cold thin air and not trigger an attack. I take along my usual drugs, plus an extra inhaler and a steroid burst pack on each trip.
I knew a guy when I was a kid growing up (and still know him) He had bad asthma, but, he was a smoker. He's still a smoker, but he doesn't have asthma anymore, 30 years later.
Asthma can be caused or triggered by many things, even psychological triggers, like nervousness, shyness etc. Immunity problems as well. Country kids have a much lower instance of Asthma, possibly because they are exposed to more airborne pollens and stuff, and develop immunity to them, where as city kids grow up in a more sterile environment as far as natural pollens and yeasts, molds etc. So they don't develop those immunities.