The Tech Report has a story about the dark side of gaming tournaments. The site notes many professional gamers use doping to improve their performance:
Australian site Game Player has published a six-page interview with Alex Walker, Director of the World Cyber Games Tournament, on the subject of doping among professional gamers. Walker makes some startling revelations in the interview:
I noticed that you made a mention about people claiming they were better after having a bong or two. That's true. I've seen a number of players at national tournaments who came in "baked" (that's stoned for the uninformed) purely so they could play better. In most cases they did, although obviously they couldn't just pull out another joint midway through.
In one WCG, a player I knew took amphetamines an hour before his match to boost his reflexes. His team ended up losing the match, although it certainly had an impact - his performance helped his team to win one map out of three - it kind of hits home that only the really talented will come out on top in the end.