Addiction is a condition that results when a person ingests a substance (e.g., alcohol,cocaine, nicotine) or engages in an activity (e.g., gambling, sex, shopping) that can be pleasurable but the continued use/act of which becomes compulsive and interferes with ordinary life responsibilities, such as work, relationships, or health. Users may not be aware that their behavior is out of control and causing problems for themselves and others. Source: https://www.psychologytoday.com/basics/addiction