The "adult use" cannabis will be sold with a 25 percent tax—three times as much as Colorado's medical marijuana tax. Will recreational users pay more for legal pot? That is the $240-an-ounce question.
Weedmaps, the Yelp of medical pot, is getting a jump on events. It's rating and reviewing medical dispensaries in Colorado that also will sell recreational pot.
(Read more: High Times aiming for $100M marijuana fund)