CALGARY, Alberta — Michael Phelps has been dropped as the keynote speaker at two events in Canada next week, with the promoter citing the Olympic champion swimmer's "widely publicized alleged use of marijuana."

Power Within Inc. of Toronto, which organizes motivational speaking events, canceled Phelps' appearances at events in Calgary and Vancouver, the Toronto Globe and Mail reported.

Power Within initially stood by the swimmer, but has now booked actor Martin Sheen as its keynote speaker for the Calgary event. The Vancouver event will feature Mehmet Oz, a regular on The Oprah Winfrey Show.

"Due to widely publicized alleged use of marijuana by Michael Phelps, the decision has been made to present the program without Mr. Phelps' participation," the company said in statement released to several Canadian media outlets.

A British tabloid published a picture of Phelps smoking from a marijuana pipe at a party in Columbia, S.C., last November. Police said last week there was not enough evidence to charge Phelps, who won a record eight gold medals at the 2008 Beijing Olympics.

Phelps has apologized for his actions, acknowledging he used "bad judgment" after the photo appeared.

Last Friday, IOC president Jacques Rogge said Phelps deserves a "second chance."