Pipe smoking is the practice of tasting (or, less commonly, inhaling) the smoke produced by burning a substance, most commonly tobacco, in a pipe. It is the oldest traditional form of smoking. Regular pipe smoking has been cited to carry serious health risks including increased danger of various forms of cancer as well as pulmonary and cardiovascular illnesses. History A number of Native American cultures have pipe-smoking traditions, which have been part of their cultures since long before the arrival of Europeans. Tobacco is often smoked, generally for ceremonial purposes, though other mixtures of sacred herbs are also common. Various types of ceremonial pipes have been smoked in ceremony to seal covenants and treaties, most notably treaties of peace (hence the misnomer, "peace pipe"). Tobacco was introduced to Europe from the Americas in the sixteenth century and spread around the world rapidly. In Asia during the nineteenth century, opium (which previously had only been eaten) was added to tobacco and smoked in pipes. Madak (the mixture of opium and tobacco) turned out to be far more addictive than orally-ingested opium, leading to social problems in China which culminated in the First (18391842) and Second Opium War (18561860). According to Alfred Dunhill, Africans have had a long tradition of smoking hemp in gourd pipes, asserting that by 1884 the King of the Baluka tribe of the Congo had established a "riamba" or hemp-smoking cult in place of fetish-worship. Enormous gourd pipes were used. In the twentieth century, pipe smoking was adopted as a preferred method of inhaling a variety of psychoactive drugs, and some claim it is a more intense method of ingestion. Smokeable crack cocaine has a reputation for being more addictive than cocaine's insufflated form. Similarly, methamphetamine has gained popularity in a crystalline form which when smoked in a pipe lets the user avoid the painful nasal irritation of snorting. When not applied to a cigarette or joint, the liquid form of PCP is typically smoked in a pipe with tobacco or cannabis. Due in no small part to successful campaigning against tobacco use, sales of pipe tobacco in Canada fell nearly 80% in a recent fifteen-year period to 27,319 kilograms in 2016, from 135,010 kilograms in 2001, according to federal data. By comparison, Canadian cigarette sales fell about 32% in the same period to 28,600,000,000 units. Pipes Pipes have been fashioned from an assortment of materials including briar,