The National Comprehensive Cancer Network (NCCN), a not-for-profit alliance of 26 of the world’s leading cancer centers devoted to patient care, research and education, stated in its 2013 "Guidelines for Patients Caring for Adolescents and Young Adults" available at

“If medications don’t seem to be working, you might want to consider asking your oncologist to prescribe medical marijuana. The active substance in marijuana—a chemical called THC (tetrahydrocannabinol)—has been shown to relieve nausea and stimulate appetite in people receiving chemotherapy. Your doctor can also prescribe a medication that contains THC such as dronabinol or nabilone. If you choose to go the more traditional route of smoking an occasional joint (or snacking on the occasional pot brownie), be sure to let your treatment team know, and educate yourself about state and federal laws related to the medicinal use of marijuana.”