the crack of opiates is hydromorphone for sure.. good strong high with no legs.
haven't taken codeine since i was 12-13 so i really don't remember what it was like.. i unfortunately started on OC's methadone, dope and suboxone so my tolerance was too high.

(not dick sizing)
so you could be right, but i just figure since it is a pro drug to morphine it would act as morphine after the change.