Physical dependence does not accompany all forms of drug dependence. Psychologic dependence is accompanied by feelings of satisfaction and a desire to repeat the drug experience or to avoid the discontent of not having it. This anticipation of effect is a powerful factor in the chronic use of psychoactive drugs and, with some drugs, may be the only obvious factor associated with intense craving and apparent compulsive use. If a drug does not cause physical dependence, discontinuing the drug does not cause a major stereotypical withdrawal syndrome. Addiction implies the risk of harm and the need to stop drug use, whether the addict understands and agrees or not.
Drug abuse is definable only in terms of societal disapproval.
Abuse of prescription and illegal drugs occurs in all socioeconomic groups, including among persons with advanced education and professional status. However, the most devastating use of psychoactive drugs still occurs in the context of poverty. Recreational drug use has increasingly become a part of Western culture, although in general, it is not sanctioned by society and is usually illegal. Recreational drugs are most often taken orally or inhaled. Taking active potent compounds by injection is usually hard to control.