My doctor prescribed Medical Marijuana to me for pain and to help my body release its natural THC. I've been using it for 6 weeks now. Prior to using it my tumor had tripled in 4 months. After using the MMJ my tumor has stopped growing. I won't know if it has shrunk or not for another 4 months when they do another CT scan. I don't smoke it, I vaporize and eat it. I don't know the medical marijuana laws in your part of the world, but it is legal in some states here.