More and more people are exploring medical marijuana, also called cannabis, as a treatment option for various chronic health conditions, including Parkinson’s disease. Several states have legalized medical cannabis, but because federal drug laws have prevented scientific investigations on cannabis and its components for many years, much is still unknown about its use for medical purposes. Patients have questions about it, and physicians are still feeling their way through the landscape of medicinal cannabis use. Dr. Danny Bega of Northwestern University’s Parkinson’s Disease and Movement Disorders Center in Chicago, a Parkinson’s Foundation Center of Excellence, sheds light on some of the issues and concerns surrounding the use of medicinal cannabis.