Two months prior to hosting aconference on narcotics at the White House, President John F. Kennedy smoked marijuana with his mistress,American socialite Mary Meyer, according to retired history professor and author ofJohn F. Kennedy: A BiographyMichaelO'Brien.During the experience, Kennedy apparently realized pot might prevent him from adequately handling a national security crisis. Meyer, a close friend of Jackie Kennedy and ex-wife of a top CIA agent, allegedly came over to the White House on the evening of July 16, 1962 after Kennedy joked that he wanted to smoke cannabis. O'Brien wrote thatWashington Post executive Jim Truitt claims to have provided Meyer with the pot: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. Kennedy allegedly told Mary that the pot 'isn't like cocaine,' and informed her that he would get her some cocaine.That same month, the Soviet Union signeda secret agreement with Cuba's Fidel Castro in order to deter any future invasions by the US after the Bay of Pigs.Nikita Khrushchev begansupplying Cuba with Soviet nuclear missiles, otherweaponry, and military personnel.SEE ALSO:The Crazy Story Of Frank Sinatra Playing A Club For A Week Straight Because Chicago's Mob Boss Was Mad At JFK Join the conversation about this storyNOW WATCH: 11 Facts That Show How Different Russia Is From The Rest Of The World Click here to read full news..