I recently bought a coffee mug at a school fundraiser. It's one of those cheap white ones made in China and decorated here, often sold as souvenirs. I have a bunch of them from various places and events. However, this one has a sticker that says: "California Law Requires This Warning. This product contains a chemical known to the State of California to cause cancer, birth defects other reproductive harm." If this one does, then presumably all the others do as well. Should I care? It's probably silly, but I've been drinking coffee out of a glass mug since I noticed this sticker -- despite the fact that I've been using other white mugs from China for almost twenty years. One more thing to worry about?