| Exhausted gases from the burning (combustion) of substances ([steady 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, stove?s and lamp?s) and the exhaust smoke is released through a chimney? or exhaust pipe. | 
| 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, stove?s and lamp?s) and the exhaust smoke is released through a chimney? or exhaust pipe. | 
See also [fire fighter]?, smog, tobacco.