Recreational pot is now legal in Colorado and Washington, and similar legalization efforts are underway in several other states.
This gradual repeal of pot laws hearkens back in many ways to earlier chapters in American history, when alcohol was banned under Prohibition, but then eventually became legal.
To help explain how marijuana legalization compares with the Prohibition Era, we're joined by historian Garrett Peck., author of "Prohibition Hangover: Alcohol in America from Demon Rum to Cult Cabernet."