Drugs Psychoactive drugs change perceptions and moods Inhibit stimulate or mimic chemical messengers Interferes with neurotransmission Tolerance and Dependence The brain adapts to drug effects tolerance Tolerance can lead to dependence Dependence Physical and Psychological cid 127 Withdrawal delirium tremens Addiction cid 127 Myths Compulsive drug cravings despite aversive side effects Addictive drugs quickly corrupt cid 127 Most people will not become addicted after 1 or 2 uses E g Morphine Addictions need therapy to be overcome Therapy helps some overcome addiction However many overcome addictions on their own E g 41 million ex smokers quit on their own Addiction is only for drugs Used for other behaviors e g gambling internet use Problematic Caution Being addicted can become an excuse Can lead to helplessness cid 127 Many more controlled occasional users of marijuana and alcohol than addicts to these substances Drugs Depressants calm neural activity and slow body functions Include alcohol barbiturates tranquilizers opiates opium morphine heroin Stimulants temporarily excite neural activity and arouse body functions Include caffeine nicotine cocaine ecstasy also a hallucinogen methamphetamines meth Hallucinogens distory perceptions and evoke sensory experiences in the absence of sensory input Include marijuana med uses LSD ecstasy cid 127 cid 127 cid 127 cid 127 cid 127 cid 127 cid 127 cid 127 cid 127 cid 127 cid 127 cid 127 cid 127 cid 127 cid 127 cid 127 cid 127 cid 127 cid 127 cid 127 cid 127 cid 127 cid 127 cid 127 cid 127
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