Growing pains: how Oregon wound up with way more pot than it can smoke

The state's glut of marijuana - over 1m lb of unsold pot - is in many ways the result of an industry still finding its feet

Trey Willison, a cannabis farmer in Eugene, first started worrying last May about there being too much marijuana in Oregon. He had sold all his "clone" plants to other growers, who were using them to cultivate yet more marijuana.

"You start doing the math on that and it just didn't make sense how people could be growing that many plants," Willison said.