This isn’t medical marijuana where you need a doctors note or something. This legalizes it. If it passes, and if a locality decides to allow sales, people from all over the country and all over the world even will some to California and spend a lot of money.
Basically, it’ll be treated like alcohol.
The “doctor’s note” is a joke. I have had people walk up to me on the street in SF offering (for a fee) to help me obtain the medical marijuana card in order to get high.
There are internet forums where potheads sit around and discuss the best “doctors” to use, which dispensaries have good bud, and so forth. For instance:
http://www.weedtracker.com/forums/
Medical marijuana is a sham - a “gateway drug” to full legalization. But everybody knows that.