Washington, Feb 3 : Olympic golden boy Michael Phelps' endorsement career is likely to take a downturn following photos showing him smoking marijuana out of a bong at a party, say market experts.
The pics published in Britain''s News of the World were taken in November at a University of South Carolina house party.
Robert Tuchman, president of Premiere Corporate Events, a sports entertainment firm said that the scandal is likely to hit eight Olympic gold medallist's advertising career.