Mo. Rev. Stat. § 191.773
Violators, guilty of infraction.
191.773. Violators, guilty of infraction. — The following persons shall be guilty of an infraction:
(1) A person who smokes in those areas where smoking is prohibited pursuant to the provisions of sections 191.765 to 191.773 and section 290.145 ;
(2) A proprietor or other person in charge of a public place or public meeting who permits, causes, suffers or allows a person to smoke in those areas where smoking is prohibited pursuant to sections 191.765 to 191.773 and section 290.145 .
(L. 1992 S.B. 509, et al. § 5)