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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 (including in stoves and lamp), but may also be used for pest control, communication ( smoke signals) or inhalation. Smoke sometimes also is a component of internal combustion engine exhaust gas, particularly diesel exhaust.

Smoke inhalation is a common cause of death in victims of indoor fires. The smoke kills by a combination of thermal damage, asphyxiation and pulmonaryThe lung is an organ belonging to the respiratory system and interfacing to the circulatory system of air-breathing vertebrates. Its function is to exchange oxygen from air with carbon dioxide from blood. The process in which this happens is called " exte irritation.

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