For the first time in more than four decades of polling, a majority of Americans say that marijuana should be legalized. Kate Auerhahn, a Temple criminologist who teaches classes on drug laws, predicted that relaxing marijuana laws would lead to a temporary spike in usage, then probably a leveling off. "I don't think that's a sign of the apocalypse," Auerhahn said, noting that a majority of the 18.1 million who admit to using marijuana in the past month do not use any other illicit drugs and are not likely to commit crimes.