The ruling says exempting the casino from the ban violates the Indiana Constitution. The Supreme Court reversed an appeals court ruling that upheld the ordinance.
The city's ban took effect in April 2012 and prohibits smoking in all businesses other than the Tropicana Evansville casino. Opponents of the ban argued that its treats their businesses unfairly.
Justice Loretta Rush dissented. She says the casino serves out-of-town customers the others don't. She also cites the casino's local tax impact.