Topic is not addressed in state statutes or regulations.
Missouri Revised Statutes 191.765. Definitions
As used in sections 191.765 to 191.773 and section 290.145, the following terms mean:
(5) “Public place”, any enclosed indoor area used by the general public or serving as a place of work including, but not limited to:
(f) Libraries, educational facilities, day care facilities, museums, auditoriums and art galleries;
(7) “Smoking”, possession of burning tobacco in the form of a cigarette, cigar, pipe or other smoking equipment.
Missouri Revised Statutes 191.767. Persons not to smoke in public places or meetings, except in designated smoking areas—designation of space for smoking area, requirements
A person shall not smoke in a public place or in a public meeting except in a designated smoking area.
A smoking area may be designated by persons having custody or control of public places, except in places in which smoking is prohibited by the fire marshal or by other law, ordinance or regulation.
No public place shall have more than thirty percent of its entire space designated as a smoking area.
A designated smoking area where state employees may smoke during the work day shall be provided by each state executive department and institution of higher education, provided such area can be adequately ventilated at minimum cost, within the physical confines of each facility.
A proprietor or other person in charge of a restaurant shall designate an area of sufficient size to accommodate usual and customary demand for nonsmoking areas by customers or patrons.