Title.
A paltry 10% productivity increase in exchange for making one of (if not the) most powerful faith rituals extremely costly is absolutely not worth it. Either it needs the odds of illness reduced by half or it needs to be a 20% or god forbid 30% productivity boost.
This doctrine is an active detriment to anyone trying to get every doctrine, and makes keeping your followers sane and compliant a lot harder unless you have hundreds of Camilla seeds lying around ready to go the second it wears off.
Or have it so that when Substances Encouraged and Substances Prohibited are both enabled, the illness rate from Prohibited are dropped drastically.
This doctrine needs something. It is far and away the worst doctrine in the entire game. None of the others come close to being this massive, awful trade off.
The buff can just be replicated by 1 structure and a gold bar, for Lamb’s sake!