By 1899, Bayer was cranking out a ton of heroin a year and selling it in twenty-three countries. In the United States, cough drops and even baby-soothing syrups were laced with heroin, ballyhooed at a time when typical opioid consumers were by now not only war veterans but also middle-aged barbers and teachers, shopkeepers and housewives. Many were mostly functioning, doctor-approved users, able to hide their habits—as long as their supply remained steady, and as long as they didn’t overdo.