I used to go to a bar dart league in my area, Metro Detroit, that still let people smoke even just a year or two ago last time I was there.

Not sure if this is 100% true or they were just bullshitting, but they explained Michigan's smoking laws were intended to protect employees who were required to be around it all the time. They claimed that if you had a privately owned establishment with no employees you could allow it.

Didn't really care to fact check them at the time but always pondered on this.