Already banned at three Major League stadiums, a bill will be introduced Friday that would make smokeless tobacco off limits at Citi Field, Yankee Stadium and other public arenas in New York City's five boroughs.

AT&T Park in San Francisco, Dodger Stadium in Los Angeles and Fenway Park in Boston have already banned smokeless tobacco.

"If New York passes this bill, and I think it will, it moves us dramatically closer to the day when smokeless tobacco is prohibited in all major league cities," said Matthew Myers, the president of Campaign for Tobacco-Free Kids, a Washington advocacy group.