President Barack Obama has admitted to smoking marijuana and using cocaine during his high school and college days. "When I was a kid, I inhaled often," he once told magazine editors, according to The New York Times. "That was the point."
Apple co-founder Steve Jobs' use of LSD in his younger days is well-documented. He once called the experience "one of the most important things in my life." His use of the drug was even noted in an FBI background check, according to Wired.