I'm guessing the study parent alluded to may have found that the exposure to asbestos greatly increased the miners' susceptibility to lung damage via cigarettes... I'll have to investigate this and confirm it.
Moral of the story, asbestos and smoking are both bad, and you should avoid both. I smoked from age 13-19, and now years later still have some problems with endurance running, but my lungs seem infinitely better than they were when I smoked. If anyone reads this and wants to quit, check out Allen Carr's "Easy Way to Stop Smoking" - the book is great but the video is excellent and was a tremendous help in my efforts to quit... There might be an