Addiction can be defined as a compulsive need for a habit-forming substance. Addiction is associated primarily with narcotic drugs or alcohol. However, a person can be addicted to anything, not just drugs and alcohol but also soft drinks, tea, coffee, driving fast cars, tobacco, gambling, food, or even sex, pornography, computers, work, and shopping / spending. While eating disorders, like other behavioral addictions, are usually considered primarily psychological disorders, they are sometimes treated as addictions, especially if they include elements of addictive behavior. For example, common food substances, especially chocolate, caffeine, sugar and salt, may have the potential for addiction. Thus addiction is basically being abnormally tolerant to and dependent on something that is psychologically or physically habit-forming.