There is no evidence that marijuana cures epilepsy or that it could replace other pain killers. Marijuana is a powerful anti inflammatory, not pain killer. The greatest health implication for marijuana is for stroke victims. If strokes could be predicted, marijuana could reduce the damage dramatically. There is no other use for marihuana that has health benefits worth bragging over. The benefits for cancer and glaucoma patients are often overstated. That's not to say there are none though.