You obviously have no idea about psychedelics, to position this as a “drugs feel good” story. Good chance at least one of the participants didn’t have a pleasurable trip. In fact, it’s a common psychedelic trope that it’s precisely the challenging, unpleasant, bad trips that truly have the potential for restorative change. Myself, my most profound and helpful psychedelic experience was a DMT trip that went in a very dreadful direction.