Английский Этимологический словарь - vapor

- 14c., from Anglo-Fr. vapour, from L. vaporem (nom. vapor) "exhalation, steam, heat." Vapors "fit of fainting, hysteria, etc." is 1662, from medieval notion of "exhalations" from the stomach or other organs affecting the brain. Vaporize is from 1634, originally "to smoke tobacco," later "to convert into vapor" (1803), and "to spray with fine mist" (1900).