A trial confirmed the insight. Further tests revealed that I have similar problems with other soft drinks that have benzoate in them but not in those that haven't. E.g. unbranded tonic water makes me ill, whereas Schweppes tonic water doesn't. I haven't been absolutely thorough in my research, but enough to convince myself. The same may or may not be true for others.
Some people believe it possibly to be carcinogenic.
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