Brown made his comments Sunday during an appearance on NBC's Meet the Press. He was asked whether legalizing marijuana was a good or bad idea for California.
Brown said the state already has medical marijuana which gets very close to what Colorado and Washington have.
"I'd really like those two states to show us how it's going to work. The problem with anything, a certain amount is okay but there is a tendency to go to extremes. And all of a sudden if there's advertising and legitimacy, how many people can get stoned and still have a great state or a great nation. The world's a pretty dangerous, very competitive. I think we need to stay alert."
In a wide-ranging interview Brown also discussed California's drought problems, climate change and his future political career.
The California Legislature is expected to adjourn its two-year session just past midnight Friday. It's an early end to what has so far been a surprisingly calm final week.
California's Senate passed a bill that would require public institutions of higher education to adopt procedures to prevent campus sexual assault and domestic violence, and to assist victims.
A bill that would require toy guns to be painted with markings to show they are fake has passed the state legislature.
The California Legislature’s “gut-and-amend” process is highly criticized, but lawmakers defend it as necessary.
Sources tell Capital Public Radio that a deal has been reached for legislation that would tighten regulations for ride-sharing companies.