WASHINGTON (AP) - Archaeologists have unearthed the earliest direct evidence of people smoking marijuana from a 2,500-year-old graveyard in western China.In a complex of lofty tombs in the Pamir Mountains - a region near the borders of modern China, Pakistan and Tajikistan - excavators found 10 wooden bowls and several stones containing burnt residue of the cannabis plant. Scientists believe heated stones were used to burn the marijuana and people then inhaled the smoke as part of a burial ritual."It's the earliest strong evidence of people getting high" on marijuana, said Mark Merlin, a botanist at the University of Hawaii....
