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Recreational drug use is the use of a drug (legal, controlled, or illegal) with the primary intention to alter the state of consciousness (through alteration of the central nervous system) in order to create positive emotions and feelings. The popular concept of this phenomenon puts it closer to a social behaviour that many places around the world tolerate rather than to serious medical conditions such as self-medication. When a substance enters the user's body, it brings on a pleasurable intoxicating effect; in terms of psychoactive drugs, such as cannabis or MDMA, this is often referred to as a "high". Recreational drug use has been associated by some with various dispositions such as curiosity, boredom, low self-esteem, desire for risk, for meditation, desire to escape from or cope with difficulties, to relax, to increase energy, and to improve focus, concentration, or creativity. Psychological disorders such as depression, trauma, social anxiety, and schizophrenia have also been claimed by some people to be promoters of drug use. Some users seek to encourage their socializing or an aphrodisiac effect.〔Working with Drug and Alcohol Users, Tony White - 2012 - Page 77〕〔Over the Influence: The Harm Reduction Guide for Managing Drugs and Alcohol, Patt Denning, Jeannie Little, Adina Glickman - 2004〕〔Situational Prison Control: Crime Prevention in Correctional Institutions, p 159, Richard Wortley - 2002〕 Drugs commonly considered capable of recreational use include ethanol, cannabis, nicotine, caffeine, and controlled substances within the scope of the United Nations' Single Convention on Narcotic Drugs and Convention on Psychotropic Substances. In 2009 it was estimated that about 3% to 6% of people aged 15 to 65 had used illegal drugs at least once (149 to 270 million). International and domestic law enforcement agencies are perpetually occupied with interdiction efforts against illegal drug use, manufacture, and distribution. ==Evolution== Genetic research has indicated that man and his distant ancestors "may have evolved to counter-exploit plant neurotoxins". The ability to use botanical chemicals to serve the function of endogenous neurotransmitters may have improved the survival rate, conferring an evolutionary advantage. A typically restrictive prehistoric diet may have emphasised the apparent benefit of consuming psychoactive drugs, which had themselves evolved to imitate neurotransmitters. "Emerging insights from plant evolutionary ecology and the genetics of hepatic enzymes, particularly cytochrome P450" have led researchers to believe that "humans have shared a co-evolutionary relationship with psychoactive plant substances for millions of years". 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Recreational drug use」の詳細全文を読む スポンサード リンク
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