THE SANDWICH BAG brims with weed. On a frosty January evening in Eugene, a University of Oregon student plops onto a couch, nestled between a whirring space heater and a muted television at a friend's off-campus apartment, and pulls a nugget from the bag. At his feet sits a backpack emblazoned with the logo of the Rose Bowl, which he and his teammates had won barely a week before. "Purple Kush," he says of his preferred marijuana strand, which he rolls into a hefty joint between his forefingers and thumbs. "It's pretty much all I smoke."