Buying marijuana in Colorado became a whole lot easier this past year when the state legalized the drug for recreational use.

It's about to get even easier, like buying a can of soda or pack of gum—at least in select locations.



Last week, a marijuana vending machine called "ZaZZZ" made headlines after Tranzbyte unit American Green unveiled the automated dispensary. American Green plans to place the machine in a medical marijuana dispensary in Eagle-Vail, Colo.

The machine, which uses an advanced ID-scanner to verify age and identity, should begin selling to the public in three to four weeks, the chief operating officer of Tranzbyte told CNBC on Monday.