To vaporize.
To mix with air.
To emit (a vapour, an odour, etc.).
To draw out; to cause to be emitted in vapour.
To pass off in the form of vapour; to emerge.
To expel (something, such as tobacco smoke) from the lungs by action of the diaphragm.
To expel air from the lungs through the nose or mouth by action of the diaphragm, to breathe out.
An exhalation.