Is medical marijuana abused?

It seems like anyone can get a prescription for medical marijuana in California. So I know a girl who got a prescription because she can't eat without being nauseous. The problem is that she is 300 lbs, making her severely obese. And she eats a ton, especially now with the marijuana. She got even fatter after going on medical marijuana, though she was still well more than 100 lbs overweight before. It seems like the real reason she gets sick when she eats is because she eats too much. A good doctor would not just give her a medical marijuana prescription without sending her to a dietician to help her lose weight. The marijuana is only helping the symptoms of a curable disease. I think she just wanted the weed and a reason to smoke it. Smoking weed is in no way helping her and only is killing her by allowing her to stuff herself and gain weight. I know that medical marijuana can help some people but don't you think doctors have been giving out prescriptions way too much?