Make the Obsidian Crown disable all healing

[Sundance]

One thing I did when I had the obsidian crown was walk around eating chips all round because the health boost is enough to negate the damage from the crown.
I don't agree the obsidian should disable all healing, it shouldn't flush chems that's for sure.

How about this? All chems work on the wearer, but concerning knock-out chems and anti-psychotics will breaks the crowns "control" over the person, rendering the crown useless until out of the wearers system.