The Commercial Appeal reports restaurants prepared for the change by primarily posting no-smoking signs to alert customers. The new law requires posting of signs that picture a red slash through a smoking cigarette.
The law applies to other eateries, too, such as certain convenience stores.
Any business that serves food will be required to ban smoking inside its walls and within 25 feet of its door.
Bingo halls, a popular place to light up, also would be prohibited from allowing smoking if concessions are sold there.
Restaurants with bars may allow smoking after 9 p.m. Also exempt from the ban are bars that only allow patrons more than 21 years old.