While about 13.7% of U.S. citizens use cannabis, here is a list of some truly notable users-

William Shakespeare- http://www.theatlantic.com/entertainment/archive/2015/08/shakespeare-marijuana-nope/401087/
George Washington
Robert Hooke
Maya Angelou
Carl Sagan
Queen Victoria
Elizabeth I of England
Christopher Columbus
William Brooke O'Shaughnessy
Egyptian Pharaohs
NeildeGrasse Tyson
Steve Jobs
Bill Gates
Morgan Freeman
Seth McFarlane
Sundar Subramanain (Indian Philosopher and Great Thinker)