Mother gave cannabis to son who fought rare form of cancer
28 March 2017 Last updated at 16:20 BST
A mother said she gave cannabis to her son while he was being treated for cancer because she was "terrified of him dying in pain".
Callie Blackwell, from Watton, Norfolk, said she took the decision after her son, Deryn, was diagnosed with a rare form of cancer.
Dr Peter McCormick, cancer researcher at the University of Surrey, said: "For all
the promising stories our own research suggest you can get the opposite effects.