Is medicine going back to the future? 50 years ago, psychedelics were a way to tune in, turn on, and drop out. They're still illegal as recreational drugs, but today's doctors are looking at them to help treat various mental health conditions, including PTSD and cancer-related depression. Natalie Gukasyan, MD, psychiatrist and assistant professor at John Hopkins University, explains the beneficial results psilocybin-assisted therapy is showing in clinical trials.