Addiction generally refers to a psychological or physical dependence accompanied by a compulsive or habitual behavior, often to a chemical substance such as alcohol. This behavior can be rewarding and positive or alleviate negative feelings, both of which reinforce continual use. Those who are addicted to something often continue using it or doing it despite negative consequences, such as declining health, financial burden, or affecting personal relationships. Addiction is fairly prevalent in human societies and can severely interfere with typical functioning, with adverse repercussions at several levels. Aside from chemical substances, it is generally accepted that behavioral addictions can also occur, such as pathological gambling or excessive use of the Internet. Gambling in particular has shown many correlates, including neurobiologically, with substance addictions.

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