The damage that smoking can do has been detailed quite thoroughly. Financially, according to the U.S. Department of Health and Human Services, the average cost of a pack of cigarettes is $8.39, and a ...
I'm a smoker and it's never given me any problems with my machine that I'm aware of. I've been running Celerons (300 and now a 550) @ 100mhz on a BH6 for the last 4 years or so.