An investigation by Associated Press finds criminal cartels akin to those in Mexico are growing weed among Colorado's sanctioned pot warehouses and farms and then shipping the product wholesale to other states, "pocketing millions of dollars from the sale." The trafficking is so easy that many exporters simply mail the stuff. In the first year of legalization, seizures of Colorado pot by the Postal Service were about 470 pounds, up from 57 pounds in 2010. Colorado's United States Attorney John Walsh admitted to AP that "there's a lot more of this activity than there was two years ago."

And in December, the Substance Abuse and Mental Health Services Administration revealed evidence that minors in Colorado lead the nation in monthly marijuana use. As pot use among teens nationwide has declined, it may be going up in the Rocky Mountain state.