1. Cannabinoid receptors and neurotransmitters are upregulated in tumor tissue., 
Studies show that cancer cells contain more cannabinoid receptors and endocannabinoids. In other words, tumors are sensitive to (one might even say our bodies are looking for) cannabinoids.
2. Cannabis addresses both cancer causes as well as its symptoms.
Cannabis not only hinders the growth and metastasis of tumors, but it has been shown to actually shrink tumors., 
Studies show cannabis prevents cancer cells from multiplying and spreading, it prevents the formation of new blood vessels to nourish cancer cells, and it induces cell death in cancer cells.
Cannabis helps decrease nausea, increase appetite, and decrease pain in cancer patients., 
“Cannabinoids… may exert palliative effects in cancer patients by preventing nausea, vomiting, and pain and by stimulating appetite.”