From ancient hunters and prehistoric collectors to the Vikings, cannabis has been used around the world for centuries, and a new report presents the colorful marijuana history .
In the report, author Barney Warf describes how thousands of years ago in Asia use of cannabis originated, and has found a way to spread to many regions of the world. Over time it spread to America 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 …