The tobacco industry’s buddies in the bar and gambling businesses are at it again, suing to try and stop Nevada's new smoke-free law, which voters approved November 7 by a margin of 54% to 46%. The law bans smoking in bars that serve meals, slot machine sections of grocery and convenience stores, in video arcades, shopping malls, schools and day-care centers. Bar and casino owners are claiming the law is unconstitutional, and saying that it will hurt their businesses, while offering no proof that it has.