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Addictions. Addiction is a condition in which the body must have a drug to avoid physical and psychological withdrawal symptoms. Addictionâs first stage is dependence, during which the search for a drug dominates an individualâs life. An addict eventually develops tolerance, which forces the person to consume larger and larger doses of the drug to get the same effect. Adapted from the Encyclopedia of Psychology.
Substance dependence also known as drug dependence is an adaptive state that develops from repeated drug administration, and which results in withdrawal upon cessation of drug use. A drug addiction, a distinct concept from substance dependence, is defined as compulsive, out-of-control drug use, despite negative consequences. An addictive drug is a drug which is both rewarding and reinforcing.