Oprah Winfrey’s ex-boyfriend is trying to pedal a tell-all book about their time together. Randolph Cook dated Oprah in 1985, and says the pair did crack cocaine together. Winfrey has already admitted this in the past, though she didn’t go into specific details about the experience. She also said that Cook introduced her to the drug, and she was so into him that she would have done anything to make him happy. Cook, however, claims that Winfrey introduced him to crack. “Oprah made a “rock” of cocaine and baking soda in the tube and heated it, a...