Having read many adventure travel books, and explorations into ethnobotany, I am a hard marker on books in this genre. I was impressed with Kilham's writing style, narrative drive, ability to quickly sketch colorful characters, and skill at connecting the lives of indigenous peoples and their herb lore to the jaded first-world reader. (He also doesn't skimp on the supporting science, but doesn't bog the reader down in it.) I learned a lot about coffee,chocolate, pot, and other psychoactive plants/pleasures, and had fun doing it. Highly recommended, as a perfect hybrid of adventure travel (replete with very amusing misadventures) and healthy mood-aleration.