my kitten is new and im learning about him, so far he doesnt mind coffee smell but when he smells cheese (gouda) or an apple, he does this squint, backs away from me, and drools (not foamy or a lot, small droplets). does this just mean new smell, a smell he doesnt like, or possibly an allergy?? my older cat never does this to any smell

this is a normal reaction?

my fingers had the smell of cheese i just ate btw.