system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
gpt
Proposition 65 in California requires that products that are sold that may cause cancer be labeled.  It's inefficient to label two sets of products - one for California and one for the rest of the country, so many companies will simply comply with the law in California and say that their product contains chemicals known to the state of California to cause cancer and birth defects or other reproductive harm.

It was intended to be a consumer advocacy measure to protect its citizens from genuinely dangerous highly toxic materials, but that label is put on just about anything, so it's lost its meaning over time.