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WHY DO PEOPLE TAKE DRUGS?
STRUCTURE AND CONTROLS
awareness or mood There are four classes
38 other sections not shown
acid action activity addiction alco amount amphetamine anabolic steroids analgesic antacids antidepressants antipsychotic aspirin barbiturates become behavior beverages block blood alcohol blood pressure body brain cancer cause cells central nervous system CHAPTER chemical chronic cigarettes clinical cocaine codeine compound concentration cough death decreased depression developed dextromethorphan disease dosage drinkers drinking drug abuse elderly endorphins enzyme estrogen example factors function hallucinogens heroin hormone increase inhalation injection intoxication irritation laws levels liver marijuana mescaline metabolism methadone minor tranquilizers morphine muscle narcotics nerve neurons neurotransmitter nicotine norepinephrine occur opiate opium oral contraceptives overdose pain patients person physical dependence physician physiological pill placebo potential pregnancy problem progestin programs psychoactive psychoactive drugs psychological dependence reaction receptors reduce release respiratory sedative sexual side effects smoking stimulation stomach symptoms tablet tion tissue tobacco tolerance toxic treat treatment users usually volatile substances wine withdrawal women