Recreational drug use is the use of psychoactive drugs for recreational purposes rather than for work, approved medical or spiritual purposes, although the distinction is not always clear. Some forms of "recreational" drug use are in fact self-medication to treat pain, pain-related problems, depression, social phobias and other disorders—so terms such as "unsupervised drug use", "non-, semi-, and sub-therapeutic drug use", and "allotherapeutic drug use" may also sometimes be appropriate. Psychopharmacologist Ronald K. Siegel refers to intoxication as the "fourth drive," arguing that the human instinct to seek mind-altering substances has so much force and persistence that it functions like the human desire to satisfy hunger, thirst and the need for shelter.

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