Generations: The Real Differences Between Gen Z, Millennials, Gen X, Boomers, and Silents—and What They Mean for America's Future

by Jean M. Twenge

In less than a decade from the late 1960s to the mid-1970s, drugs went from counterculture to mainstream. By the 1970s, drug use was no longer a way to rebel—it was a way to fit in, and it had spread widely.