Inured to Alchemy

You've developed control over how your body processes alchemical poisons and drugs. Each of your successful saving throws against an alchemical poison, a drug, or an addiction reduces the stage by 2, or by 1 for a virulent alchemical poison, drug, or addiction. Each critical success reduces the stage by 3, or by 2 for a virulent alchemical poison, drug, or addiction.