Gov. Jennifer Granholm will sign Michigan's smoking ban into law Friday at a Lansing brew pub.
Lawmakers finished passing the ban last week. Granholm plans to sign the measure at the Michigan Brewing Co.
Once signed, 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.
Michigan will become the 38th state to limit smoking in public places such as government buildings, bars and restaurants, as well as work places.