I just wanted to chime in on the pipe and cigar smokers. I’ve heard the opinion that these aren’t that bad because you don’t inhale the smoke. However, that smoke is STILL floating all around the room. We’ve heard all the terrible health warnings regarding the damage of secondhand smoke (a reason why it is being banned in restaurants across North America), so effectively with a pipe or cigar, you’re just flooding the room with second hand smoke that you breathe back in yourself.
Chaw is bad stuff too. Check out this picture of Rick Bender, who at age 26 had parts of his jaw, neck and toungue removed because of throat cancer:
And don’t get me started on you pot smokers.