_____ is a substance in tobacco products that causes stained teeth and skin.

(1 point)
• Nicotine
• Carbon monoxide
• Tar
• Menthol

3 answers

Tar

_______ is a substance in tobacco smoke that reduces the blood's ability to carry oxygen.
(1 point)
• Tar
• Nicotine
• Asthma
• Carbon monoxide

Carbon monoxide