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Smoke is a suspension in air of small particles resulting from incomplete combustion of a fuel. It is commonly an unwanted by-product of fires, but may also be used for 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.

Smoke inhalation is a common cause of death in victims of indoor fires. The smoke kills by a combination of thermal damage, asphyxiation and pulmonary irritation.

See also fire fighter, smog, tobacco.

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