When voters in Colorado and Washington state legalized recreational marijuana in November, they thought they were declaring a cease-fire in the War on Drugs. Thanks to ballot initiatives that passed by wide margins on Election Day, adults 21 or older in both states can now legally possess up to an ounce of marijuana. The new laws also compel Colorado and Washington to license private businesses to cultivate and sell pot, and to levy taxes on the proceeds. Together, the two states expect to reap some $600 million annually in marijuana revenues for schools, roads and other projects. The only losers, in fact, will be the Mexican drug lords, who currently supply as much as two-thirds of America's pot.

Drug reformers can scarcely believe their landslide victories at the polls. "People expected this day would come, but most didn't expect it to come this soon," says Norm Stamper, a former Seattle police chief who campaigned for legalization. "This is the beginning of the end of prohibition."

But the war over pot may be far from over. Legalization has set Colorado and Washington on a collision course with the Obama administration, which has shown no sign of backing down on its full-scale assault on pot growers and distributors ...........