Can Marijuana Cure Cancer? Proof of Effectiveness? Is marijuana a cure for cancer? If so, how effective is it? Well, currently, there really is no proof that marijuana can cure cancer.
This is the reason why the Food and Drug Administration has issued warning letters to some marijuana companies who “claim to prevent, diagnose, treat, or cure cancer without evidence to support these outcomes”. Here are the four companies and their unsubstantiated claim on marijuana as a cure for cancer: