vaporium (noun) – a place where e-cigarettes may be purchased or consumed; a steam bath or sauna in which patients are exposed to therapeutic vapors (also vaporarium)
BREAKDOWN: VAP- (steam or mist) + -OR (state) + -IUM (place)
This word is built on the root VAP-, which means steam or mist.
Common VAP- words include evaporation and vapor.
More esoteric VAP- words include devaporation and pervaporate.