Re: A thematic question regarding Life Support (Disease) and (Poisons)
There could be a subconsciously-controlled (or consciously-controlled) mechanism that intervenes when actual damage is about to occur. Perhaps an ego roll is required to shake off all non-toxic effects, otherwise the person's body simply repairs the damage when it occurs, whether the SFX is a natural resistance or mind-linked nanobots that patrol the body and remove toxins (or toxic metabolites). Maybe the chemical's damage isn't a primary effect but the toxic side effects are a result of metabolizing the substance? Alcohol combined with acetaminophen is a fairly good example, as this combination overwhelms the liver's ability to remove toxins from the blood. Perhaps the character's liver recognizes harmful toxins and removes them, but not necessarily their precursors?