"The Terrible Truth," from 1951.
Apparently, there was a nasty drug called "marijuana" that was popular in the early 1950s. Fortunately, aggressive government programs, tough policing, public service programs, and education were enough to rid America of "the reefer" forever.
NOTE: The director of "The Terrible Truth," Sid Davis, passed away this month. Check Jesse Walker's H&R obit here. This video on predator homosexuals (it's a "disease of the mind!"), called "Boys Beware" is fun, too.