Poppers is the street term for various alkyl nitrites taken for recreational purposes through direct inhalation, particularly amyl nitrite, butyl nitrite and isobutyl nitrite. Amyl nitrite has a centuries-long history of safe use in treating angina, as well as an antidote to cyanide poisoning. Amyl nitrite and several other alkyl nitrites which are used in over-the-counter products, such as air fresheners and video head cleaners, may be inhaled to enhance sexual pleasure. Use is particularly prominent among urban gay men. These products have long been part of the club culture from the 1970s disco scene to the 1980s and 1990s rave scene.