It seems hard to believe now, but back in the days before the health dangers of smoking were fully and widely known, many athletes and other notable sports figures regularly lit up, even during competition or broadcasts. A few persist now with this bad habit, but as you look at the 31 notables in this gallery, you may wonder how some of them were able to achieve the things they did while essentially poisoning their bodies. CLICK HERE to read Adrian Dater's SI.com story on the days when the NHL was engulfed in tobacco smoke.