http://ngm.nationalgeographic.com/2015/06/marijuana/sides-text

Science Seeks to Unlock Marijuana’s Secrets

As the once-vilified drug becomes more accepted, researchers around the world are trying to understand how it works and how it might fight disease.

“There’s nothing new about cannabis, of course. It’s been around humankind pretty much forever.

“In Siberia charred seeds have been found inside burial mounds dating back to 3000 B.C. The Chinese were using cannabis as a medicine thousands of years ago. Marijuana is deeply American too—as American as George Washington, who grew hemp at Mount Vernon. For most of the country’s history, cannabis was legal, commonly found in tinctures and extracts….”

Great article on the research being done on marijuana in the June 2015 issue of National Geographic. Online at the above link.