Californians have watered down the phrase 'cancer-causing' so much that probably nobody cares! I guess being down-wind of a Starbucks counts as being in a sacrifice zone according to Californian regulations!
Yep, California has raised the bar, and to do so it had to take risks. In particular, it risked looking silly-- and in penis-politics looking silly in front of your opponents is an existential risk. The good news is, some of these risks paid off and became national standards. So, thanks to California, you are poisoned a little less every day. Speaking personally: fuck you for making fun of that effort!
The risk posed by these different items varies wildly, but they're all treated the same from a warning label perspective. And once you realize benign items get the label, you start to ignore it wherever you see it.
What California did for air quality is fantastic. I'm proud of my state for its leadership on that and related things. But that doesn't excuse the failure of Prop 65 warnings. They're worse than just "silly". They dilute real warnings and cause people to ignore the whole lot.