Thanks for some good posts clearing things up. Just a charade for the sake of the impossible and absurd dream of having chess be an olympic sport.
I wouldn't think you'd want to mess yourself up in any way before playing a big match. Stimulants, depressants - anything you're not used to would just screw with your mental process. Only stuff you'd want would be things you take all the time already (like drinking your coffee and evidently for some in this forum, puffing the chalice).
Those playing the Scotch Game are under suspicion.