History of Weed smoking

From the sites where prehistoric hunters and gatherers lived, to ancient China and Viking ships, cannabis has been used across the world for ages, and a new report presents the drug's colorful history.

In the report, author Barney Warf describes how cannabis use originated thousands of years ago in Asia, and has since found its way to many regions of the world, eventually spreading to the Americas and the United States.

"For the most part, it was widely used for medicine and spiritual purposes, " during pre-modern times, said Warf, a professor of geography at the University of Kansas in Lawrence. For example, the Vikings and medieval Germans used cannabis for relieving pain during childbirth and for toothaches, he said.

"The idea that this is an evil drug is a very recent construction, " and the fact that it is illegal is a "historical anomaly, " Warf said. Marijuana has been legal in many regions of the world for most of its history.

Where did pot come from?

It is important to distinguish between the two familiar subspecies of the cannabis plant, Warf said. Cannabis sativa, known as marijuana, has psychoactive properties. The other plant is Cannabis sativa L. (The L was included in the name in honor of the botanist Carl Linnaeus.) This subspecies is known as hemp; it is a nonpsychoactive form of cannabis, and is used in manufacturing products such as oil, cloth and fuel. [11 Odd Facts About Marijuana]

A second psychoactive species of the plant, Cannabis indica, was identified by the French naturalist Jean-Baptiste Lamarck, and a third, uncommon one, Cannabis ruderalis, was named in 1924 by Russian botanist D.E. Janischevisky.

Cannabis plants are believed to have evolved on the steppes of Central Asia, specifically in the regions that are now Mongolia and southern Siberia, according to Warf. The history of cannabis use goes back as far as 12, 000 years, which places the plant among humanity's oldest cultivated crops, according to information in the book "Marihuana: The First Twelve Thousand Years" (Springer, 1980).

"It likely flourished in the nutrient-rich dump sites of prehistoric hunters and gatherers, " Warf wrote in his study.