If marijuana was legal for adults in California, would more people show up at work high? And how would that change the definition of a "smoke break" during work hours? That's the latest issue facing proponents of Proposition 19, the ballot measure that would make marijuana legal for adults in California. Voters will have a chance in November to decide whether to legalize marijuana for recreational purposes for adults over 21 but the political debate over the controversial issue has been heating up for quite some time.