air taken into and sent out of the lungs

respiration

a sending out or giving off (of something)

issuance, diffusion

a strong-smelling substance produced in glands by male deer, used in the manufacture of perfumes

scent

(US = odor) a pleasant or unpleasant smell

scent

breathing (the usual word)

breathing

the wet, gassy form of water or other liquids

fumes, mist

vapour

fumes, mist