The world’s oldest weed stash was found in a 2,700-year-old grave in the Gobi Desert in 2008.
Nearly two pounds of the still-green plant material was found. A barrage of tests proved the marijuana possessed potent psychoactive properties and casts doubt on the theory that the ancients only grew the plant for hemp in order to make clothing, rope and other objects.
Yes, they used it for getting high too.
The stash was found lightly pounded in a wooden bowl in a leather basket near the head of a blue-eyed Caucasian man who died when he was about 45. Researchers believe he was a shaman from the Gushi people, who spoke a now-extinct language called Tocharian that was similar to Celtic.
What is still in question is how the marijuana was administered, since no pipes or other objects associated with smoking were found in the grave. It is currently believed it was ingested orally or fumigated. (Source)