SPRINGFIELD - Antismoking advocates pointed to a statewide survey Thursday to declare Illinois' six-month-old ban on public smoking a success.

Nearly three-quarters of the more than 600 registered voters surveyed said they think the state's ban on smoking has been beneficial. Support increased by nearly 10 percentage points since the same company conducted a similar poll a year ago, when the issue was debated statewide.

Residents were surveyed by a private international polling agency on behalf of the American Lung Association of Illinois, American Cancer Society-Illinois and the Respiratory Health Association of Metropolitan Chicago.

"Clearly, the public understands that cigarette smoke in the workplace is a serious health hazard," said Joel Africk, president of the Respiratory Health Association of Metropolitan Chicago. "Public opinion is key behind smoke-free Illinois."

While advocates say the ban is growing in strength as public support increases, they continue to fight efforts by Illinois casino operators, who are claiming a 17 percent loss in revenue since the ban took effect.

Tom Swoik, director of the Illinois Casino Gaming Association, said casinos' revenue shortfall translates to less money the state can spend on other projects.

"I suspect that we will continue to try to get some waiver for the casinos," Swoik said. He added that he hasn't seen a difference in casino air quality since Jan. 1.

Kartikay Mehrotra may be reached at kartikay.mehrotra@.lee.net or 789-0865.