Evidence is mounting that psychedelic drugs can help treat diseases. Here are the most promising uses

Ever since drugs like psilocybin, the active ingredient in hallucinogenic mushrooms, appeared to help quell anxiety in cancer patients several years ago, the compounds have seen something of a resurgence of interest among scientists. Researchers are currently studying the potential of drugs ranging from ecstasy to ayahuasca to treat mental illnesses including depression and PTSD.