Where there's smoke, there's a potential jackpot. Or so it seems at Arizona's 22 casinos, which are on Native American land, where state anti-smoking laws don't apply. But in an age when an estimated 80 percent of Americans don't smoke, tribal casinos are investing in smoke-clearing equipment to keep non-smokers happy and playing the slots. "It's a business decision casinos are making," said Sheila Morago, executive director of the Arizona Indian Gaming Association.