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.”
Emerald Health, a Canadian cannabis pharmaceutical company, is developing what could be a “holy grail” treatment for sufferers of Multiple Sclerosis (MS).
So how does the Endocannabinoid System (ECS) in our bodies work? To understand this, we first have to understand some basics about cells and cell-to-cell communications.
A cell is the smallest unit of life. Cells are often called the "building blocks of life." Our bodies are comprised of trillions and trillions of different cells, approximately 32.7 trillion cells in all, of more than 200 different types.
Each cell has a particular function to perform. At the same time, however, cells cluster to form tissues, organs, and body systems, where they work together with other cells to serve larger functions (see Figure 1)
Figure 1: Cell Clusters
There are many different methods used to process cannabis and obtain its active ingredients. As far as cannabis users are concerned, the primary difference between the various processes is: which components from the original plant remain in the final extract?