Possible Clues:

• Everybody in hospital with little cigarette returns with terrible reaction
• Abnormally sensitive to certain foods
• Grace ill prepared for this reaction
• Everyone sent to work unit? I start to cower, having an aversion
• Abnormally sensitive girl Alec upset
• Hypersensitive (to a substance)
• Reacting (to certain substances)
• Suffering from hayfever
• Having unfavourable reaction to foods or plants
• Grill ace butcher? That'll have something to do with the reaction!