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- Heroin: Depressant; slows down the central nervous system, leading to drowsiness, respiratory depression, and potential overdose; highly addictive with severe withdrawal symptoms.
- Ecstasy: Stimulant and hallucinogen; increases serotonin, dopamine, and norepinephrine, causing euphoria, heightened sensory perception, and emotional warmth; risks include dehydration, hyperthermia, and long-term neurotoxicity.
- Marijuana: Depressant and mild hallucinogen; affects cannabinoid receptors, altering mood, perception, and coordination; can cause short-term memory impairment, anxiety, or paranoia in some users.