A municipality may, by ordinance ratified by voters in a regular municipal election, exempt the municipality from the provisions of AS 18.35.301 - 18.35.350. Unless the municipality has adopted an ordinance banning smoking in certain public places, if a municipality exempts itself from the provisions of AS 18.35.301 - 18.35.350, former AS 18.35.300 - 18.35.365 apply in the municipality as those statutes provided on September 30, 2018.