If you've walked into a bar or restaurant in the past six months, you've probably noticed the difference.
"You can breathe when you're in the bar, you feel better when you leave, you don't have that smoke-hangover," Mary Sapienza said.
Sapienza is a non-smoker and all for Michigan's smoking ban. The Department of Community health said she's not alone, a new survey says 70 percent of Michganders support the new law.
"A lot of people are excited they don't have to go to a place where they can smell smoke," James McCurtis of the Department of Community Health said.
There are business owners who have never liked the law, and still don't, saying the ban is affecting their bottom line.
"I've lost about 20 percent of my business per month," Mike Ryan said.
Ryan is the owner of Auggie's bar in Lansing. He said smokers are simply opting to stay home.
"It's been bad in the summer, I can't imagine what it will be like in the winter when people are going out in 10 degree weather to have a cigarette," Ryan said.
Tom Burke is one of those customers.
"I do stay home more because I can't smoke in the bar," Burke said. "I enjoy smoking when I drink."
Which has created a problem for Ryan, and owners like him he said.
"In six months or so, we might have to close," he said.
McCurtis said as long as a majority of people want the law, the department will promote it.
"It's our job to promote good health and well being, and we believe that's what this law does," he said.