Having enjoyed Michael Pollan’s “How to Change Your Mind” on psychedelics (in particular psilocybin), I was intrigued by a book that goes much broader on drug use: Dr. Carl Hart’s “Drug Use for Grown Ups.” Hart is a professor of psychology at Columbia and is basing this book on both his research and his extensive personal experience. While I have one criticism (more on that later), the book makes a very strong case that drugs should be decriminalized broadly: not just marijuana, but everythin...