4. John F. Kennedy:
Kennedy (the realest one on this list) has gone on the record stating that he has consumed marijuana — on a regular basis — to help with his back pain (even during his term) and even thought about legalizing marijuana during his second term, according to a few written documents.
An excerpt from: John F. Kennedy: A Biography, which described this White House scene:
On the evening of July 16, 1962, according to [Washington Postexecutive] Jim Truitt, Kennedy and Mary Meyer smoked marijuana together. … The president smoked three of the six joints Mary brought to him. At first he felt no effects. Then he closed his eyes and refused a fourth joint. ‘Suppose the Russians did something now,’ he said.