I am not familiar with U.S. law.
In Israel, medical marijuana, specifically but not exclusively for cancer patients, is widely used, encouraged by physicians, and the cost is significantly subsidized by the government. Much of the credit goes to Rabbi Litzman of the Agudat Yisrael party and Minister of Health for his efforts in creating this very effective project.
The purchase of this cannabis is strictly regulated and limited, and patients are given instruction in a hospital as to the various methods of use. A little research will show that there are a multitude of varieties, and the officially sanctioned growers have to abide by specific guidelines. Its’ efficacy has been proven beyond doubt. True, it does not benefit everyone, but the majority find significant relief with its use. Can it be abused by non-cancer-patients ? Yes, of course. But the Israeli system feels that the benefits far outweigh the risks. Someone who is interested in abusing this drug will find it much easier to buy it on the street illegally than from a former cancer patient.
The FDA has traditionally been very deliberate and cautious in approving new drugs and treatments, and they should be. They have very strict standards of approval, and are subject to political pressures and other considerations. But they are not the sole possessors of scientific information and research.