Addiction is a neuropsychological disorder characterized by a persistent and intense urge to use a drug or engage in a behaviour that produces natural reward, despite substantial harm and other negative consequences.

Addiction is a complex and chronic disease characterized by the compulsive and uncontrollable use of a substance or engagement in a behavior despite harmful consequences. It often involves the development of physical and psychological dependence on the addictive substance or behavior. Repetitive drug use often alters brain function in ways that perpetuate craving, and weakens (but does not completely negate) self-control.

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