If you haven't already caught this, Chinese players Wang Yue and Li Chao were eliminated from the 2009 FIDE World Cup after turning up late for their playoff games in the third round. The reason for the lateness was that they were outside the playing hall having a smoke. Alerted that their games were about to start, both players rushed inside, but it was too late, and the games were declared loss.
The most astonishing thing about this (apart from the obvious problems with 0 minute forfeit times) was that Li Chao didn't even smoke before the tournament, and only took it up to join Wang Yue's 'smoking group'.
Chessvibes have coverage and comment here, while there is an interview with the 2 players here.