> " This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm" are widely derided? The prob

> " This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm" are widely derided? The problem with those warnings is not their existence, but the fact they are unspecific. If the ingredients on food containers just said "This contains an allergen", people would ignore them too. The way to make the California warnings useful would be to list which specific chemical is the problem, so that it is actionable. Similarly, for the headphones case, listing the specific problem allows the user to take into account their specific situation (climate, usage pattern etc.) to decide if it's applicable to them. Obviously if the warning just said "this is hazardous", it's worse than useless.