I found this information at http://avogadro.chem.iastate.edu/MSDS/NaHSO3.htm.  Not sure what volume is required to elicit these potential health effects:

Eye: May cause eye irritation and possible burns. May cause eye injury. 
Skin: Prolonged and/or repeated contact may cause irritation and/or dermatitis. May cause skin sensitization, an allergic reaction, which becomes evident upon re-exposure to this material. Contact with skin causes irritation and possible burns, especially if the skin is wet or moist. 
Ingestion: May cause severe gastrointestinal tract irritation with nausea, vomiting and possible burns. Exposure may cause central nervous system depression, gastrointestinal and cardiac abnormalities. Sulfite compounds may cause a severe aller gic reaction in sensitive individuals. 
Inhalation: Causes severe irritation of upper respiratory tract with coughing, burns, breathing difficulty, and possible coma. May cause asthmatic attacks due to allergic sensitization of the respiratory tract. May cause effects similar to those described for ingestion. 
Chronic: Prolonged or repeated skin contact may cause dermatitis. 

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