Question

______ is a substance in tobacco products that causes stained teeth and skin. (1 point)
○ nicotine
○ carbon monoxide
○ tar
○ menthol

Explanation:

Nicotine is the addictive component of tobacco, carbon monoxide reduces oxygen in blood, menthol is a flavoring agent. Tar is the sticky, dark substance in tobacco that leaves stains on teeth and skin.

Answer:

C. Tar