Legalize it, and Californians will be too stoned to care about trifles like "secure borders."
Come to think of it, that's probably the main problem now.
What makes you think that many people want to get that stoned that often? Do YOU want to get that stoned that often?
"..may be easier to grow it in the United States instead of trying to smuggle it across the border.."
Hard to believe that. Criminals smuggle tractor-trailer loads of illegals. They can't smuggle pot?