I can imagine that acid is any corrosive substance which is applied to the outside of the body, while poisons are induced by inhalation or being bitten or stabbed by a poisoned weapon/fang/claw etc...
Another thing that makes me go hmmm is the way the game treats poisons as something that creates an ongoing damaging effect while in real life most poisons and venoms have more of a debilitating effect, which would be more on par with the old nausea in exile or more of a "it's just a matter of time before you are dead" effect.
Please help.
Thanks!
I didn't find the right solution from the Internet.