America’s first president may have been one of the nation’s original users of medicinal marijuana.

George Washington’s rotting teeth and the dentures that replaced them—made of hippopotamus ivory, gold springs, and brass screws—caused enormous pain, which some believe he alleviated with weed as evidenced from a passage from one of the president’s letters:

“Began to separate the male from female plants rather too late...Pulling up the (male) hemp. Was too late for the blossom hemp by three weeks or a month.”