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Recreational drug use is the use of one or more psychoactive drugs to induce an altered state of consciousness either for pleasure or for some other casual purpose or pastime. When a psychoactive drug enters the user's body, it induces an intoxicating effect. Generally, recreational drugs are divided into three categories: depressants (drugs that induce a feeling of relaxation and calmness), stimulants (drugs that induce a sense of energy and alertness), and hallucinogens (drugs that induce perceptual distortions such as hallucination).

In popular practice, recreational drug use generally is a tolerated social behaviour, rather than perceived as the medical condition of self-medication. However, drug use and drug addiction are severely stigmatized everywhere in the world. Many people also use prescribed and controlled depressants such as opioids, as well as opiates and benzodiazepines. What controlled substances are considered generally unlawful to possess varies by country, but usually includes cannabis, cocaine, opioids, MDMA, amphetamine, methamphetamine, psychedelics, benzodiazepines, and barbiturates. As of 2015, it is estimated that about 5% of people worldwide aged 15 to 65 (158 million to 351 million) had used controlled drugs at least once.

Common recreational drugs include caffeine, commonly found in coffee, tea, soft drinks, and chocolate; alcohol, commonly found in beer, wine, cocktails, and distilled spirits; nicotine, commonly found in tobacco, tobacco-based products, and electronic cigarettes; cannabis and hashish (with legality of possession varying inter/intra-nationally); and the controlled substances listed as controlled drugs in the Single Convention on Narcotic Drugs (1961) and the Convention on Psychotropic Substances (1971) of the United Nations (UN). Since the early 2000s, the European Union (EU) has developed several comprehensive and multidisciplinary strategies as part of its drug policy in order to prevent the diffusion of recreational drug use and abuse among the European population and raise public awareness on the adverse effects of drugs among all member states of the European Union, as well as conjoined efforts with European law enforcement agencies, such as the Europol and EMCDDA, in order to counter organized crime and illegal drug trade in Europe.

Recreational drug use refers to using certain drugs for enjoyment or leisure purposes instead of for medicinal reasons. Some common recreational drugs include caffeine, alcohol, nicotine, marijuana, and synthetic drugs like ecstasy. While many countries consider recreational drug use legal, there are still laws surrounding their consumption and distribution. The EU has implemented various policies aimed at reducing recreational drug use and addressing issues related to drug trafficking within its borders.

People often take recreational drugs because they want to experience feelings of euphoria, increased energy levels, or enhanced sensory perception. However, these drugs can have serious side effects, including dependence, withdrawal symptoms, impaired judgment and motor skills, and even death. Additionally, recreational drug use can lead to legal consequences, financial problems, strained relationships, and health issues such as mental illness, organ damage, and overdose. Despite these risks, many individuals continue to engage in recreational drug use due to peer pressure, stress relief, or simply for the thrill of it. Overall, recreational drug use poses significant dangers to both individual users and society as a whole.