More than 100 cannabinoids have been identified in the marijuana plant. Of these marijuana molecules, tetrahydrocannabinol (THC) and cannabidiol (CBD) have been studied most extensively .CBD destroys breast cancer cells by down-regulating a gene called ID-1, which is implicated in several types of aggressive cancer. Silencing the ID-1 gene is, thus, is a potential strategy for cancer treatment.In 2007, McAllister published a detailed account of how cannabidiol kills breast cancer cells and destroys malignant tumors by switching off expression of the ID-1 gene, a protein that appears to play a major role as a cancer cell conductor. The ID-1 gene is active during human embryonic development, after which it turns off and stays off. But in breast cancer and several other types of metastatic cancer, the ID-1 gene becomes active again, causing malignant cells to invade and metastasize. “Dozens of aggressive cancers express this gene,” explains McAllister. He postulates that...