LANSING (WKZO) -- A study released today shows that the state ban on smoking in bars and restaurants has had little negative effect on the overall food service industry and by-the-glass liquor sales in Michigan.

The Michigan Department of Community Health released the study, which analyzed the economic effects of the "Dr. Ron Davis Smoke-Free Air Law."  The study found no significant negative effects on the overall sales of food, drinks, and Keno tickets in Michigan bars and restaurants.

The study, conducted by the  University of Michigan-Institute for Social Research, concedes that individual bars and restaurants 'saw sales fluctuations' after passage of the law. 

In December of 2009, Michigan became the 38th state to ban smoking in food and establishments to protect bar and restaurant workers from exposure to second-hand smoke.