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.
Never going to stop the users Medical or others, I understand that and that is their business. It is when it encroaches on others rights that it becomes a HUGE problem and unless your personally effected all is good.