Never seen this before. I am currently in Chilapa, Guerrero doing some work with my friends at GEA (Grupo de Estudios Ambientales, A.C.), and this morning one of the young researchers from Columbia (thx, Bibiana) offered me an interesting tea bag containing the leaves of Erythroxylum coca Lam. Apparently, you can buy this product in several health food stores in Bogota and other big cities in Columbia). [NOTE: Go here for a nice article about coca tea].