At the beginning of the year, Colorado became the first state to legalise cannabis, after voters approved the change in 2012.
The result is not only the birth of new marijuana tour companies, but also a startling burgeoning of the cannabis industry as a whole.
Business graduates and young entrepreneurs such as Brett Schneider of The MaryJane Group have flooded into the state looking to get in on the action.
"I think the sky is the limit for the industry," he says.
"One of the things I've learned is that the real way to go about it is to be safe and responsible. If you hold those as your two brand attributes that you really stand true to, you can change the perception of cannabis."Read More