I make it a point to bring a large container of peanuts aboard every time I fly. I munch a few and then exhale several times before swallowing, then take another mouthfull and repeat. I ensure that there is a liberal amount of peanut "plasma" in the airplane's atmosphere.
The peanut allergy fanatics were encouraged by the anti-smoking fanatics who have put smoking on the fringes and the anti-perfume/cologne crowd. IMHO, if you are that allergic to peanuts that the mere smell brings on life-threatening reactions, then you have no business forcing your allergy on the rest of us.
If my actions on the peanuts seem rude and obnoxious, they are no more so than the anti-smell crowd who insist that we follow their desires implicitly.