I'm allergic to milk and all milk-related products: milk, cheese, anything else dairy, and a whole bunch of stuff that you'd never think from looking at an ingredients list is actually milk. This is different from lactose intolerance; I can digest milk; I'm just allergic to it. My tolerance to it has dramatically increased over many years by gradually increasing my milk intake, so I can have a glass of milk or a few pieces of cheese a day easily without getting sick.
In the mornings, if I'm hungry, I have a bowl of Quaker Squares, the most delicious cereal ever created. But I can't stand the smell of the milk. I don't know what it is about it—if it's somehow related to the allergy (huh?) or some weird psychological thing. I just find the smell of milk revolting. If I eat the cereal right away and then get rid of the bowl it doesn't bother me. But if I'm busy and that bowl sits on the far edge of my desk for too long, eventually the whole office smells like milk. And it's gross.