@Herbivore I hope you know this is highly misleading.

The groups are based on the quality of the evidence, not the magnitude of the effect.

It's not even known if the effect from nitrate salt, the active ingredient causing cancer in this case, has strong enough effect to be meaningful in practice.

That is why it hasn't been baned yet, if it were proven: it would as it is an unnecessary additive.

Nitrate is added for colour.