Australian tennis player Pat Cash has let slip about his past drug use - after he confessed to baking marijuana cookies in his sporting heyday during a U.K. radio interview. The sporting ace - who has previously admitted to smoking cannabis on his way to winning the 1987 Wimbledon tennis championships - made the contentious revelation during a live interview with fellow tennis star Michael Stich, while they were discussing fellow tennis stars' hobbies on BBC Radio Five Live. Cash said: "The only think I used to bake was a bit of hash cookies in the old days." But bosses at the station are not impressed and have since warned the star to be more cautious on air. A spokeswoman for Radio Five Live says, "Pat has been asked to be more careful on air."