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People who have a personality with many traits that make them prone to addiction are said to have an addictive personality. An addiction is a physical or psychological dependency that influences the life of that person negatively. Very often, such people use illegal drugs, but this does not have to be the case: many can also be addicted to smoking, gambling, food, exercise, work, video games, pornography or relationships. This is called codependency. People with an addictive personality tend to plan their lives around the addiction. Addictive personality is difficult to treat.