Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

alcohol, drugs, or other matters that result in a person becoming dependent upon them. Such addictive drugs consist of amphetamines and stimulants similar to amphetamines that stimulate the central nervous system, caffeine, heroin, cocaine, drugs which present hallucinations, those which can be snorted or inhaled, opiates, nicotine, phencyclidine and drugs similar to it, and drugs which weaken the central nervous system. Alcohol is also included.

ADDICTIVE DRUGS: "There are a few addictive drugs which are so potent, one exposure can cause a person to become dependent and come back for more, one such drug being heroin."

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