Long-term exposure to opioid drugs
A. has not been clearly shown to produce damage to any tissue or organ system.
B. causes damage to the mesolimbic dopamine system.
C. can weaken the heart.
D. is a common cause of kidney disease.
Question 2
In a heroin user, negative reinforcement of drug-taking behavior can occur when
A. the user overdoses and almost dies.
B. the person is trying the drug for the first time.
C. withdrawal symptoms are alleviated by another injection.
D. the user sees a needle or syringe.
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