By one of our users:
Tobacco is harmful, but like any poison, dose is important. Smoking a pack of cigarettes every day will noticeably increase risks for various diseases, but an occasional smoke from a pipe or cigar (which are inherently healthier because the smoke doesn’t enter the lungs) will not increase the risk much above the baseline. The choice is between a possibly slightly longer life by abstaining, and a definitely richer one by smoking in moderation. There may be other reasons for choosing not to smoke, but a metalhead is not scared away by a minor statistical danger when there are tangible benefits to be had. - Paul Warkin