Usually the forms of salicylate/benzoate/paraben people get exposed
to are dietary. Respiratory exposure is unusual, though some people
get asthma attacks from handling salicylate-containing fruit.
What fruits naturally contain salicylate?

Almost all of them. See the list on my website.

I can understand it if they were chewing willow bark...

Willow bark doesn't. It contains salicin, a chemical precursor of
salicylate (probably cross-reactive with it in allergic people but
I'm guessing).

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