Personally I've noticed that I tend to look past the items with labels. I don't like to buy them. So the the labels seem to do something, at least as a data point.
In that case, does the labeled item situation protect me from cancer more than the no-label same-items I see in another state? I have to wonder...Personally I think I'd rather know. Maybe the label sizing can be made adjustable based on contents, but it's not a terrible start vs. no warning at all.