“Cannabidiol-induced apoptosis in primary lymphocytes is associated with oxidative stress-dependent activation of caspase-8” and “The non-psychoactive cannabidiol triggers caspase activation and oxidative stress in human glioma cells… we have shown that the non-psychoactive cannabinoid compound cannabidiol (CBD) induces apoptosis (cell death) of glioma cells in vitro and tumor regression…”

http://www.ncbi.nlm.nih.gov/pubmed/17950393