Article continues below advertisementRobert F. Kennedy Jr. First Tried Heroin When He Was a TeenSource: MEGARobert F. Kennedy Jr. has been open about his past drug use.Robert F. Kennedy Jr.'s drug addiction was part of a troubled period in his early life.The son of the late Senator Robert F. Kennedy and Ethel Kennedy told The New Yorker he first tried heroin when he was a teen. He used to do drugs with Lem Billings, a close family friend, at the latter's apartment on Manhattan's Upper East Side.In the book The Kennedys: An American Drama, an ex-girlfriend of one of RFK Jr.