How about we help those little alchemists deal with all the things they keep breathing or drinking?
Poison Fueled Feat 12
Prerequisite(s) Poison Resistance
Your blood has become used to having a healthy dose of toxic chemicals to the point you almost need it now. You resistance to poison damage is equal to your level now and when you take persistent poison damage you now heal that much each turn instead. You still roll to end the effect as normal and can not elect to keep the damage going. If the damage is multiple damage types, you still heal as long as the persistent damage contains the poison type.