Rather than calling for national legalization, John Hickenlooper wants marijuana to no longer be a Schedule 1 controlled substance so it can be studied.
Competition has driven down the price of marijuana, which means many smaller mom and pop dispensaries in Colorado struggle.
The Denver marijuana enterprise made large amounts of money from "looping," a practice where some customers would repeatedly return to the same store to buy marijuana intended for black market sale.
El Paso recreational cannabis customers have to either shop in the quaint resort town of Manitou Springs, or take I-25 south to Pueblo or north to Denver.
In Boulder, 13 people have applied and four were eligible for an expungement. In Denver, 48 people have applied so far.
The program will help people vacate convictions for any marijuana offense now legal under state law. The city estimates around 10,000 convictions could be eligible.
Hickenlooper has managed to keep people guessing over the years about how he really feels about legal marijuana.
When state voters legalized recreational marijuana through Amendment 64 earlier this decade, the e-cigarette industry had just started to take off.