No matter how big or small your office is, the smell of certain foods will flow. Even if you have your own office with a microwave in it, and you think you’re being kind by shutting the door while you microwave your leftovers, the smell will escape. If your co workers are looking at you funny on your way back from the kitchen, there is a reason.
Nobody ever eats toast at work either. At least I can’t tell if they do because toast is practically odorless if you don’t burn it. Or maybe it’s just that the smell of toast is overpowered by the deliciously smelly cabbage somebody brought in from their garden and nuked up for lunch.