I have no earthly idea why Carol finds it necessary to be so combative, but I'll answer it: "to some people, a great deal, and to most people, slightly."
I grew up in a world filled with smokers, and a great many of my relatives suffered from it in various ways. It surely *contributed* to my dad's terminal lung cancer, and my mom suffered a great deal with COPD until she finally managed to quit. I smoked indoors until my son was 9, and his bronchitis was so bad he was missing 20+ days of school every year, but as soon as I started taking my smoking outdoors, he was able to manage perfect attendance.
My asthma didn't bother me nearly as much when I smoked as it does now, but I attribute that to the topical-anesthetic "smoothing agents" in cigarette tobacco -- my lungs were basically "numb", but just because I didn't feel their distress, doesn't mean it wasn't there, and I had a hour-long coughup every morning just to get rid of the crap they left behind. Now my asthma bothers me a lot more, because I can actually feel when my lungs are struggling, however my morning congestion is down to a cough or 3, not an hour or more.
My overall belief is that smoking is really not good for anyone, but it is very far from being the universal killer it is characterized as being; all the ANTZ nanny posturing is just control-freak puritanism, and they can all bite me; if anything could ever induce me to smoke again, it might be just so I could blow some smoke in their faces!
Andria