To eat greedily or quickly.
To eat very quickly.
To draw air or any form of gas (either in a pure form, or mixed with small particles in form of aerosols/smoke -sometimes stemming from a medicament) into the lungs, through the nose or mouth by action of the diaphragm.
To draw air into the lungs, through the nose or mouth by action of the diaphragm.
An inhalation.