Pretty much every state, national, and international health or safety organizations deals with possible carcinogens, or sometimes probable carcinogens, because testing to prove something is a carcinogen is expensive.

California’s threshold is far too low to be useful. The end result is basically https://en.wikipedia.org/wiki/Alarm_fatigue

Well, the “experts” say a charred steak is carcinogenic. At that point, I stopped listening to anything out of their mouths. It might be true, but it’s also a matter of degree.

California has set such a low threshold that one cannot take their label seriously about anything. It applies to nearly everything, making it effectively a useless warning.