"Michael Pollan dives deep into three plant drugs -- opium, caffeine, and mescaline -- and throws the fundamental strangeness, and arbitrariness, of our thinking about them into sharp relief. Exploring and participating in the cultures that have grown up around these drugs, while consuming (or in the case of caffeine, trying not to consume) them, Pollan reckons with the powerful human attraction to psychoactive plants, and the equally powerful taboos...