The Michigan Legislature passed a long-delayed smoking ban Thursday, with exceptions for three Detroit casinos that have to compete with tribal casinos not affected by the ban.

The Democrat-led House agreed Thursday afternoon to slight changes made by the Republican-led Senate earlier in the day. The bill now goes to Democratic Gov. Jennifer Granholm, who welcomed the bill's passage.

"It's a terrific gift to Michigan," she told reporters.

The ban will take effect in May 2010. It applies to all bars, restaurants and work places, except for the Detroit casinos, cigar bars, tobacco specialty stores, home offices and motor vehicles.

Although smoking will be allowed on casino gambling floors, it will be banned in the casinos' bars, restaurants and hotels.

The Senate approved a ban with no exceptions last year, but that bill failed in the House, which wanted the exceptions for the Detroit casinos. The House in May passed the bill adopted Thursday by the Senate.