I'm a Kalifornian like you and I have neighbors who I know consume pot regularly. I hope they are growing their own now and don't have contact with the illegal drug community. They and I will be better off.
Would I prefer that they didn't consume at all? Of course. I don't use drugs, alcohol, or nicotine. I can't even tolerate caffeine any more. The laws we had and those we still have are and would always be ineffective. People make up their own minds about what they should be permitted to do. Government action to prevent them won't work if a significant number are unsupportive.