The odorless, colorless gas found in motor vehicle emissions and cigarette smoke is carbon dioxide.

Name: The odorless, colorless gas found in motor vehicle emissions and cigarette smoke is carbon dioxide.
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Quizplus · Accepted Answer

The odorless, colorless gas found in motor vehicle emissions and cigarette smoke is carbon monoxide, not carbon dioxide. Carbon dioxide is also a colorless gas found in the atmosphere and is a natural part of the Earth's carbon cycle.

The Odorless, Colorless Gas Found in Motor Vehicle Emissions and Cigarette