He asked me if there was any peanut butter or other nut products anywhere in my (immaculately clean) home. I advised there was an unopened jar of peanut butter in the cupboard, but that it was still sealed with the foil top and the plastic lid.
Nope, that wasn't good enough. He asked me to please put it in the detached garage while they were visiting. I find it rather hard to believe nut residue could remotely be that powerful.
To quote Obi-wan, "May the nuts be with you. Always."
Nope, he wasn't fearful of the "fumes" or "vapors" of the peanut butter somehow escaping the sealed jar. He was afraid of the possibility of a "mistake" - e.g., some befuddled person getting up in the middle of the night for a snack i a strange house, or a child mistakenly opening the jar, etc.
Accidents can happen. By removing the source, he was playing it extra-safe.
Regards,