Smoke

Smoke is an aerosol emitted when a material undergoes combustion or pyrolysis, together with the quantity of air that is entrained or otherwise mixed into the mass. It is commonly an unwanted by-product of fires, but may also be used for pest control (fumigation), communication, defensive and offensive capabilities in the military, cooking, or smoking. It is used in rituals where incense, sage, or resin is burned to produce a smell for spiritual or magical purposes.

It can also be a flavoring agent and preservative.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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