Define nicotine
-written answer-
-midnight-

Nicotine is a stimulant drug that speeds up the messages travelling between the brain and body. It is the main psychoactive ingredient in tobacco products and so this Drug Facts page will focus on the effects of nicotine when consumed by using tobacco.

Explanation:

hope this helped :]

a. steroid--> influences moods in the limbic system

b. inhalant--> dissolves fatty tissue in the brain

c. marijuana--> changes how the hippocampus processes sensations