natural painkiller. Chart on 542 How does caffeine, heroin, marijuana, meth, alcohol, cocaine, ecstasy effect the CNS? Caffeine- helps keep a person awake by interfering with the effects of inhibitory neurotransmitters in the brain; Heroin-travels rapidly to the brain where it is converted to morphine which brings a rush of euphoria. Marijuana- Person experiences mild euphoria along with alterations in vision and judgment; Meth-stimulant, it reverses the effects of fatigue, maintains wakefulness and…
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