When Todd’s psychiatrist suggested he start taking psychedelics, he figured it was a joke. It wasn’t. The former corporate executive from Colorado retired in 2006 after an MRI revealed his spine was riddled with a dozen tumors called hemangiomas, which later spread to his brain. Todd was told he would die before the end of 2008. Somehow, Todd has survived—he credits medical marijuana, which he now uses daily—but he is still considered terminal. “It could be tomorrow.