They should have to include some actual reason, perhaps a QR code or something which can produce a Cancer Facts.

Or really just add Cancer Facts into Nutrition Facts, complete with estimated QALY cost per serving. They should also incorporate IQ damage and not only cancer.

It's a stupid oversight in the law, there is zero penalty for incorrectly labeling something as causing cancer, so nobody does any actual work to see if they have used an ingredient or substance worth warning for, and just slaps a cheap sticker on instead.

It's the equivalent of putting "no artificial sweeteners" on a bag of sugar.