With Donald Trump nominating Cabinet members who have spoken out against legal marijuana, some are arguing that the war on drugs may make a comeback. But while there’s reason for anxiety among those selling recreational marijuana legally in states like Colorado and Washington, an all-out war remains unlikely. Experts say that trying to undo legalization at this point would come with serious economic and political hurdles. “It’s certainly come so far,” says Sam Kamin, a marijuana law expert at the University of Denver, “that it can’t be undone without a heavy cost.” Others are even more skeptical.