The body treats radium as calcium, that doesn't mean that we need radium in our bones.  The body's just a very complicated machine whose mechanisms are only purposeful in ideal conditions.

Introducing higher than normal quantities of any psychoactive compounds is essentially poisoning one's system, though not necessarily in a toxic manner.  The body can adapt to these conditions, but I doubt that it necessarily seeks out these conditions without pre-existent and long-term favorable exposure to such conditions written into its genetic makeup.