Horn of Africa and south Arabian countries all grow and chew khat by social custom. Khat contains an ephedra-like drug. It is on the WADA in-competition list only, with a listed threshold. I have always wondered whether the EA elites chew khat OOC, and if so, does it give them more "on" days and enhance their results.
I'm not saying that's cheating or unfair - pseudoephedrine is legal OOC too, after all. But ephedra use isn't traditional in the west as it is in EA. Could it be that EA's are tailor-made for intense athletics training by their tradition?