Smoking

For the purposes of separating persons who smoke from persons who do not smoke for the comfort and health of persons not smoking, in every place of public assembly there shall be an area where smoking is not permitted, which shall be designated a no smoking are; provided that no more than one half of the rooms in any health care facility in which persons are confined as a matter of health care may be designated as smoking areas in their entirety.  ORC §3791.031 (B)

A “place or public assembly” means enclosed theaters, except the lobby, opera houses, auditoriums, classrooms, elevators, rooms in which persons are confined as a matter of health care, all buildings and other enclosed structures owned by the state, its agencies and political subdivisions and any building that has a seating capacity of fifty (50) or more persons and is available to the public. All restaurants, food service establishments or other rooms used primarily for the service of food, as well as places licensed by the Department of Liquor Control to sell intoxicating beverages for consumption on the premises do not qualify as places of public assembly.  ORC §3791.031 (A)

Additionally, smoking is often regulated by local ordinance.

Smoking