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Stimulant
A substance that increases activity in the central nervous system or the body, leading to increased alertness and physical activity.
Narcotic
A class of drugs that reduce pain, alter mood and behavior, and usually induce sleep or stupor; often leading to dependence.
Hallucinogen
A substance that induces alterations in perception, mood, consciousness, and thought, typically producing hallucinations.
Withdrawal Symptoms
Physical or psychological symptoms that occur after stopping or reducing intake of a substance.
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