Try walking in to a real doctor's office and saying "I have a headache, can I get some opiates?" They will hand you some Tylenol and charge you a few hundred dollars for the trouble. In California if you do such a a thing you will get a prescription for pot, with unlimited refills.
"Medical marijuana" is nothing more than an attempt to avoid actual public debate on the issue of legalizing marijuana. In a few years, Californians will be pushing for complete legalization of pot, claiming that fraud and deceit (intentionally allowed by lawmakers) have made widespread use commonplace. And since things aren't so bad now, then what would be the harm in legalizing marijuana outright?