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Addiction is defined as a chronic, relapsing brain disease that is characterized by compulsive drug seeking and use, despite harmful consequences. â  It is considered a brain disease because drugs change the brainâthey change its structure and how it works.
Recent scientific evidence finds that: 1  Chemical addiction is a brain disease. 2  Chemical dependence is a chronic, relapsing disease that requires changes in behavior for the individual. 3  Addiction treatment is as effective in reducing the symptoms of the disease as are most treatments for heart disease, asthma and diabetes.