Recreational stimulants are natural materials, commercially refined, that stimulate the nervous system, the circulation of the blood, and metabolism, and that make foods tastier and more palatable. They are consumed in food (sugar, spices), as hot beverages (coffee, tea, cocoa), or as “liquors” (beer, wine, spirits) or narcotics (tobacco, opiates; see Opium; Drug use). Many recreational stimulants increase feelings of strength in the short t…