Go us indeed... If I were to guess, I'd say the primary reason that it isn't big here is because codeine isn't very easily available. In lots of countries codeine is available over the counter and it's the starting point for the synthesis of the "krokodil". If memory serves, when you make the stuff right it's a heck of a good drug and is manufactured commercially in some countries. Can't remember though, that was a lecture a long time ago.