Question

what is a colorless, odorless, and poisonous gas found in cigarette smoke? carbon monoxide nitrogen oxide carbon dioxide magnesium oxide

Explanation:

Carbon monoxide (\(CO\)) is a colorless, odorless, and poisonous gas. It is found in cigarette smoke. Magnesium oxide (\(MgO\)) is a solid. Carbon dioxide (\(CO_2\)) is a colorless and odorless gas but is not poisonous in the context of being a major component of the atmosphere (though high concentrations can be harmful). Nitrogen oxide (\(NO\) or \(NO_2\) etc.) has characteristic odors in some cases (like \(NO_2\) has a reddish - brown color and a pungent odor).

Answer:

Carbon monoxide