_______ is a substance in tobacco products that causes stained teeth and skin.
(1 point)
Responses
Nicotine
Nicotine
Carbon monoxide
Carbon monoxide
Tar
Tar
Menthol
1 answer
Tar
(1 point)
Responses
Nicotine
Nicotine
Carbon monoxide
Carbon monoxide
Tar
Tar
Menthol
1 answer