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alcohol (depressant)
agonist for GABA
opioids (depressant)
agonist for dopamine (relieve pain)
heroin (depressant)
agonist for dopamine
morphine (depressant)
agonist for dopamine
nicotine (stimulant)
agonist for acetycholine
cocaine (stimulant)
agonist for dopamine
cannabis (hallucinogen)
agonist for dopamine
LSD (hallucinogen)
agonist for serotonin