My food allergies do not seem to apply to foods that are served around me but which I do not actually consume. I do have a bad reaction to smoke but unless the amounts are excessive, that's a matter of unpleasant feelings as opposed to actual illness. But it's nothing like, for example, how some people react to the proximity of peanuts.
As you can read here, Southwest Airlines has become the latest carrier to give up completely on offering peanuts to its passengers. Good idea. I'm for anything that recognizes that some people just plain have bad reactions to foods that others can eat with nary a care.