Hello not sure if anyone has try this out. My dad has been diagnose with Lung cancer stage 4 and has already spread to his bones. He also has a tumor on his right leg and is on a lot of pain. He started chemo last Thursday and seem to be doing OK; however, the pain has increased and has not had a good night of sleep. I'm willing to do anything to help him with the pain a rest a little longer. I was told that the CBD oil can help with pain. Is it safe to used if he is under chemo treatment? If so how much can I give him a day?