[Cordova Belle]

Ditto, Fawnn. I took Oxycontin ONCE after a terrible root canal experience. Put me soundly to sleep. Anyone who could do talk radio while taking Oxycontin is either Superman, or has an extremely high tolerance level.

[sarasota]

Tolerance builds up over time. Seem to recall that Matthew Perry had a similar problem/experience/rehab.

[FreedomSurge]

One more possibility, he is in extreme pain. Opiates are not addictive to and can be tolerated in high doses by those who are in great pain.