But it can be tricky for medical marijuana entrepreneurs to get started because of all the laws, and quickly changing regulations within communities.
Greenway University, a medical marijuana business school, hosted a seminar this weekend to teach people how to open a dispensary and run it legally and successfully.
It was a two-day seminar at the Tabor Center in downtown Denver, and it was sold out. The school has helped open more than 200 dispensaries in California.
Gus Escamilla of Greenway University says his organization welcomes all of the laws and regulations city and state leaders are formulating for the medical marijuana industry...so that medical marijuana users and business operators have the best possible environment.