The swimmer admits to engaging in 'regrettable' behavior and showing 'bad judgment' after British tabloid runs photo of him appearing to smoke marijuana. He is unlikely to face any punishment as the d Swimmer Michael Phelps, who has won more gold medals than anyone in Olympic history, acknowledged Sunday he had engaged in "regrettable" behavior and shown "bad judgment" after a photo of him smoking what appears to be marijuana from a glass pipe was published in a British tabloid over the weekend.