Any substance in the gaseous, or aeriform, state, the
condition of which is ordinarily that of a liquid or solid.

In a loose and popular sense, any visible diffused substance
floating in the atmosphere and impairing its transparency, as smoke,
fog, etc.

Wind; flatulence.

Something unsubstantial, fleeting, or transitory; unreal
fancy; vain imagination; idle talk; boasting.

An old name for hypochondria, or melancholy; the blues.

A medicinal agent designed for administration in the form of
inhaled vapor.

To pass off in fumes, or as a moist, floating substance,
whether visible or invisible, to steam; to be exhaled; to evaporate.

To emit vapor or fumes.

To talk idly; to boast or vaunt; to brag.