Drugs and behavior:

absorption acid action potentials activity addicts administration amphetamine animal antidepressants appear atropine axon barbiturates behavior benzodiaze benzodiazepines biturates block blood levels brain caffeine cannabinoids cannabis cause cell body chlordiazepoxide cigarette cocaine cohol consumption crease decrease dependence depression diazepam diazepines digestive system discriminate drawal drinkers drinking drug effects effects of alcohol enzyme ethanol excretion experiment fects Figure GABA given Grinspoon hallucinogens heroin high doses higher doses humans increase injection ionized Journal known lipid soluble liver low doses marijuana membrane mescaline metabolism metabolites methadone methylxanthines molecules monkeys morphine muscle nervous system neurons neurotransmitter nicotine nonhumans normal opiate opium orally overdose pattern pentobarbital percent Pharmacology phenobarbital placebo plant Press produce rats receptor reinforcement response result schedule self-administration shows Siegel similar sleep smoking stimulated subjects substances synapses therapeutic tion tobacco treatment users usually withdrawal symptoms York