While ordinary folk have a sense of smell that capable, you're correct about no allergic reaction to the smell of peanuts.You don't have an allergic reaction from smelling the peanut butter on a kid's sandwich down or even across the table from you. You'd have to have Wolverine's sense of smell to even smell someone's sandwich from down a table, you certainly aren't going to have an allergic reaction to someone else's lunch from inhalation unless you are shoving your face right over it and trying to suck it up your nose.
(I didn't know that til I checked some sources. Learn sumthin new every day!)
Can the smell of peanut butter cause an allergic reaction? | AllergyHome.org
But if the smell is from cooking or preparation, there can be airborne proteins which are allergenic.
Airborne peanut dust can happen with some products too....
http://allergicliving.com/index.php/2010/08/25/can-i-react-to-the-smell-of-peanutnuts/
As dangerous as peanuts can be to some, I find it reasonable to ban them in schools.
I wouldn't ban them, but I understand why many would.
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