The smoking of any substance in those areas designated by the board of aldermen as being prohibited is declared to be a health nuisance. It shall be unlawful to smoke any substance in any room, corridor, space or area owned or controlled by the city which is posted with a sign indicating that smoking is prohibited. Any person who violates this provision shall be deemed to have committed a municipal infraction and shall be fined twenty dollars ($20.00). (Ord. No. G-79-10, § 1, 3-1-79)