Addiction is defined as a constantly persistent, relapsing mental disorder. It is considered a mental disorder because drugs change the function of the brain and its structure. These brain changes can be long-lasting and can lead to the harmful behaviors. Most abused drugs produce intense feelings of pleasure. The initial decision to take drugs is typically voluntary. The common characteristic of all addictive substances is that they activate the brain’s reward system, either directly or indirectly. The positive and negative consequences of substance use vary greatly depending on the specific drug being used. The primary features of substance use disorders are a mixture of cognitive, behavioral, and physiological symptoms.
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