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...rats, only some rats develop a pattern of self-administration of stimulant drugs, supporting the existence of some inherent propensity for addictive tendenc ...ging their [[emotion]]s by developing addiction to alcohol, other types of drugs, or other pleasurable activities.<ref name=Nelson/> ...

{{About|pharmacodynamics and pharmacokinetics of ethanol|ethanol as a psychoactive drug|alcohol (drug)|alcohols used in medicine|alcohols (medicine)|the subst ...nges in a vulnerable brain that drive the compulsive seeking and taking of drugs, and loss of control over drug use, that define a state of addiction.&nbsp; ...