Deryn Blackwell was diagnosed with a rare, aggressive form of leukemia at just 10-years-old. By the age of 14, Blackwell had already undergone multiple rounds of chemotherapy and radiotherapy which doctors said would be the end. They had no other treatments, so Blackwell lay dying in a hospice when his mom gave him cannabis to ease his pain and anxiety. She was forced to buy cannabis from a dealer because doctors refused to prescribe cannabis-based painkillers. Then, Blackwell began to gradually recover, so scientists are now calling for further research into the effects of cannabis compounds on cancer cells.