n (uncountable) The visible vapor/vapour, gases, and fine particles given off by burning or smoldering material.
n (colloquial|countable|never plural) An instance of smoking a cigarette, cigar, etc.; the duration of this act.
n (uncountable|figuratively) A fleeting illusion; something insubstantial, evanescent, unreal, transitory, or without result.
n (uncountable|figuratively) Something used to obscure or conceal; an obscuring condition; see also 'smoke and mirrors'.
n (military|uncountable) A particulate of solid or liquid particles dispersed into the air on the battlefield to degrade enemy ground or for aerial observation. Smoke has many uses--smokescreen|screening smoke, signaling smoke, smoke curtain, smoke haze, and smoke deception. Thus it is an artificial aerosol.
v (slang) To perform (e.g. music) energetically or skillfully. Almost always in present participle form.