Marc Lewis's relationship with drugs began in a New England boarding school where, as a bullied and homesick fifteen-year-old, he made brief escapes from reality by way of cough medicine, alcohol, and marijuana. In Berkeley, California, in its hippie heyday, he found methamphetamine and LSD and heroin. He sniffed nitrous oxide in Malaysia and frequented Calcutta's opium dens. Ultimately, though, his journey took him where it takes most addicts: into...