Stimulant refers to a psychoactive substance that has an activating effect on the central nervous system. A Stimulant
elevates mood, activity, and alertness. Stimulants include substances such as amphetamines, caffeine, cocaine, and nicotine.
Other /More definition:
stimulant refers to psychoactive substance that elevates mood, activity, and alertness. Such substances include amphetamines, caffeine, cocaine, and nicotine.

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