A cloud of fine particles suspended in a gas WordNet 3.0 & Open English WordNet

Smoke is a suspension of airborne particulates and gases emitted when a material undergoes combustion or pyrolysis, together with the quantity of air that is entrained or otherwise mixed into the mass. Wikipedia

Mass of airborne particulates and gases Wikidata

Solids in the air that have been generated by the condensation of vapors, chemical reactions or sublimation OmegaWiki

An aerosol, consisting of visible particles and gases, produced by the incomplete burning of carbon-based materials, such as wood and fossil fuels. OmegaWiki

A material that has been vaporized from the solid or liquid state to the gas state and re-coalesced to the solid state. Wiktionary

Material that has re-coalesced to the solid state. Wiktionary (translation)

A particulate of solid or liquid particles dispersed into the air on the battlefield to degrade enemy ground or for aerial observation. Smoke has many uses--screening smoke, signaling smoke, smoke curtain, smoke haze, and smoke deception. Thus it is an artificial aerosol. Wiktionary