Snake oil is a term used to describe deceptive marketing, health care fraud, or a scam. Similarly, snake oil salesman is a common label used to describe someone who sells, promotes, or is a general proponent of some valueless or fraudulent cure, remedy, or solution. The term comes from the "snake oil" that used to be sold as a cure-all elixir for many kinds of physiological problems. Many 18th-century European and 19th-century United States entrepreneurs advertised and sold mineral oil as "snake oil liniment", making claims about its efficacy as a panacea. Patent medicines that claimed to be panaceas were extremely common from the 18th century until the 20th century, particularly among vendors masking addictive drugs such as cocaine, amphetamine, alcohol, and opium-based concoctions or elixirs, to be sold at medicine shows as medication or products promoting health.