A man named Rick Simpson started treating his skin cancer in 2003 with a homemade remedy made from the hemp plant. He began by soaking the hemp in pure naphtha or isopropyl alcohol allowing the therapeutic compounds to be drawn out of the plant, leaving him with a tar-like liquid once the solvent fully evaporated. Also know as Phoenix Tears Rick Simpson Oil (RSO) can be administered orally or placed directly on the skin. There are many variations of Rick Simpson Oil currently on the market, some are high in THC while others contain only the non-psychoactive compounds such as CBD.