This is why it would be good to ask scientists when drafting legislation regarding scientific issues. The California law is well intended, but the effect is to require warnings for any quantity of any substance known or suspected of causing cancer. The result is warning labels on everything, which of course, .leads to said labels being either overinterpreted (I can’t eat anything!) or completely ignored. Fact is, coffee has been researched exhaustively, most probably due to the researchers drinking heroic quantities themselves, and cancer is not really a worry. Haven’t actually proven by benefits either, but my coworkers don’t seem bothered by that at all.