A former boyfriend of Oprah Winfrey is claiming that the talk show host used to be a crack smoker.

Oprah has admitted to dabbling with drugs during the 70s when she dated a troubled drug user.

But her ex-boyfriend Randolph Cook says that it was the chat show host who got him hooked, and not the other way around, according to the National Enquirer.

Randolph - who has only two years to live after being diagnosed with esophageal cancer - blames Oprah for his condition and claims that she has been under the influence on her show.

Randolph says, "Americans have placed Oprah on a pedestal that has been seemingly invincible until now."

The kiss and tell ex reveals intimate details of his and Oprah's alleged drug-fuelled relationship in The Wizard of O: My Life With Oprah.

See some other stars giving in to temptation below