smoke, fog, etc suspended floating in the air and impairing its transparency

a substance in the gaseous state, esp such a substance that is liquid under normal conditions

(the vapours) dated a depressed or hysterical condition

archaic a foolish or fanciful idea

What amazing vapours a lonely man may get into his head — H G Wells

to rise or pass off in vapour

to emit vapour

to indulge in bragging, blustering, or foolish talk

to cause (something) to pass off as vapour