Jada Pinkett Smith begins her new memoir Worthy in Ojai, California. The Prologue, titled “The Heroine’s Journey” and set in January 2012, finds Pinkett Smith searching for “the Medicine Woman.” The medicine in question is ayahuasca, a plant-based psychedelic that’s been known to have healing, and often transformative, effects. “Before I can tell you what transpired over the next four …