George Washington, William Shakespeare, and Carl Sagan may be some of history’s greatest minds and most celebrated figures, but they’d all probably be in prison today if they were still alive. What would make these unlikely cellmates so dangerous that they’d have to be kept off the streets? Was Shakespeare a serial arsonist? Did Carl Sagan fly into a homicidal rage whenever somebody claimed to have invented a perpetual motion machine? No, the threat these historical icons posed to the public is much worse: They all smoked marijuana.

The idea that cannabis is a dangerous substance that should be avoided at all cost is a relatively modern invention. In fact, historians now believe that Egyptian pharaoh Ramesses II regularly used marijuana, possibly to relieve eye pain. But if cannabis has indeed been in use for millennia, how come there has never been a single recorded instance of a person dying of a marijuana overdose? Think about that for a moment: In thousands of years of recorded history, not one person has ever died of THC poisoning, yet the federal government maintains that marijuana is among the most dangerous substances in existence.