a chemical smell/taste?

Hi all. A relative of mine is very talented in the kitchen and often sends extras. Problem: since early summer or so, things sporadically seem to have a chemical taste that can also be smelled when the package is opened. I've smelled it on cookies, cake, veggies, chicken... I thought it was Pam that turned chemical-ly for some reason but how long does a can last..? And it doesn't seem to be on everything. Only one person other than myself seems to notice it. Just wondering if anyone had an idea as to what it might be..? TIA

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