“Substance addiction is a behavioral disorder characterized by a compulsive drive for the reinforcing euphoria, loss of control over it, and substance use despite adverse consequences leading to the sacrifice of normative life goals, values, coping mechanisms and functioning (including health, family, work, etc.) at the altar of the substance.
People often confuse physical dependence (tolerance and withdrawal) with addiction (partly because the confusing DSM-IV and earlier definition of substance dependence was synonymous with addiction). The oral, long-acting opioid agonists currently FDA approved to treat opioid use disorders produce physical dependence, but by diminishing the reinforcing effects of short-acting opioids they function to extinguish addictive behavior.”
Source: TheIncidentalEconomist.com – August 14, 2014