"One of the governor's concerns: "This high-THC marijuana, what can it do to a brain that is still developing?"

"Some of the anxiety has been laid to rest. We don't see a spike in adult use. We don't think we see a spike in youth consumption although there are some things that are disconcerting."

"As Colorado attempts to build its brand as a healthy state, marijuana "dilutes what you're trying to do."

"We have tax revenue that's going to allow us to look in a much more comprehensive way at intervening in addiction."

"We have a responsibility and an obligation to do everything we can to try to make this work."

"On unanticipated problems: There's been "a dramatic increase in edibles." And "no one had ever worried about dosage sizes. The original edibles that came out, once you took the packaging off there was nothing to show it was any different than candy."

"One of the governor's complaints: federal rules that prohibit dispensary owners from putting their money in banks. "If you really want to introduce corruption into legal marijuana," he said, make it an all cash business."

"On what motivated Colorado voters: "Let's face it, the War on Drugs was a disaster. It may be well intentioned ... but it sent millions of kids to prison, gave them felonies often times when they had no violent crimes ... I was against this, but I can see why so many people supported it."