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(uncountable) The visible vapor/vapour, gases, and fine particles given off by burning or smoldering material.
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(colloquial, countable) A cigarette.
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(colloquial, uncountable) Anything to smoke (e.g. cigarettes, marijuana, etc.)
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(colloquial, countable, never plural) An instance of smoking a cigarette, cigar, etc.; the duration of this act.
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(uncountable, figuratively) A fleeting illusion; something insubstantial, evanescent, unreal, transitory, or without result.
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(uncountable, figuratively) Something used to obscure or conceal; an obscuring condition; see also smoke and mirrors.
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(uncountable) A light grey color tinted with blue.
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(uncountable, slang) Bother; problems; hassle.
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(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--screening smoke, signaling smoke, smoke curtain, smoke haze, and smoke deception. Thus it is an artificial aerosol.
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(baseball, slang) A fastball.
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(countable) A distinct column of smoke, such as indicating a burning area or fire.