Encyclopedia of Science | Addiction

• Chemical addictions
• Words to Know
• Nonchemical addictions
• The addict
• Treatment of addiction

Addictions can be physical (of the body), psychological (of the mind), or both. In fact, almost any behavior can be termed an addiction if it becomes the primary focus of a person's life, and especially if it results in harmful effects to one's physical health and well-being. The term addiction is most commonly associated with a person's compulsive and habitual desire to consume a chemical substance, such as alcohol or other drugs. The addict's life is eventually dominated by the craving. It is estimated that up to 25 percent of the American population displays some form of addictive behavior.

Chemical...