What is cannabis oil and how does it work?

Your questions about the medical use of cannabis oil answered

Cannabis oils are extracts from cannabis plants. Unprocessed, they contain the same 100 or so active ingredients as the plants, but the balance of compounds depends on the specific plants the oil comes from. The two main active substances in cannabis plants are cannabidiol, or CBD, and delta-9 tetrahydrocannabinol, or THC. Oil extracted from hemp plants can contain a lot of CBD, while oil from skunk plants will contain far more THC. THC produces the high that recreational cannabis users seek, while oils for medical use contain mostly CBD.