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Addiction is a habit driven by mental or physical craving for a particular stimulus. The stimulus may be an activity or a chemical substance. The absence of the desired stimulus can cause different degrees of withdrawal, depending on the level of addiction.
An addiction can be thought of as an abnormal or excessive dependence on a substance or task. The most common form of addiction is drug addition, which is the result of drug use and which can have significant health effects and may lead to criminal activity. The most common drug additions are alcholism and nicotine addictions. Like gambling additions, drug addictions also have significant psychological effects.
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