Why Do So Many Chefs Smoke?

I can't believe that I watch Hell's Kitchen. I really think that Gordon Ramsay is an obnoxious jerk... with the people skills of a grapenut. I really love to watch it because of that fact I guess. He really is a person I love to hate, and I don't care how much money would be involved, but I would never work for the man. What I find really interesting is how all of the chefs that are competing... all smoke like chimneys! Season after season, all the contestants light up after work. I wonder why this is. With less than 30% of the population smoking I am wondering if all 30% work in kitchens!