Occasional (leather, soap): -5 points.
Common (smoke, wood): -10 points.
Very Common (grass, metal): -15 points.
You have an incapacitating supernatural reaction to an ordinarily innocuous substance. If you touch or breathe the substance, you must immediately make a HT roll. On a failure, you are at -5 to all skills and attributes for the next 10 minutes. If you ingest the substance, you are at -5 to attributes and -10 to all skills and Sense rolls for 10 minutes. Point value depends on the rarity of the substance; please use the "Note" section of your abilities page to detail how this ability works for you and how its point cost was calculated. To do this, you'll want to view the full text here: Revulsion