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Exhausted gases from the burning (combustion) of substances (solid state, liquids, or gases), either by accident or for the purpose of heating, lamp light, power generation, pest control, communication (smoke signals) or inhalation. Controlled combustion normally takes place in closed containers (such as engines, stoves and lamps) and the exhaust smoke is released through a chimney or exhaust pipe.

See also fire fighter, smog, tobacco.