Sumo wrestlers with pot bellies, yes. Sumo wrestlers with pot? Now that's harder to grapple with.

In the past six months, four wrestlers have been kicked out of the ancient sport for allegedly smoking marijuana, creating the biggest drugs-in-sports scandal that Japan has ever seen.

Although three of the wrestlers who have been expelled from the sport were from Russia, the arrest of a 25-year-old Japanese athlete who goes by the ring name of Wakakirin for possession of marijuana raised concerns that use of the drug may be more widespread than originally thought.