Ohio Revised Code Title XXXVII. Health Safety Morals § 3794.05

Notwithstanding any other provision of this chapter, the owner, manager, operator, or other person in charge or control of an establishment, facility, or outdoor area which does not otherwise qualify as a public place or place of employment may declare such establishment, facility, or outdoor area as a nonsmoking place. Smoking shall be prohibited in any place declared nonsmoking under this section where a sign conforming to the requirements of section 3794.06 is posted.