Question about lead and christmas tree lights?

Hey. I recently bought a strand of christmas tree lights. upon opening them, i noticed a white label attached to the strand. it said Proposition 65 and that the strand contained lead and that in California, exposure was known to cause cancer and birth defects? Ive never seen this before? I researched and found a website that stated that most electrical appliance cords have lead coating, to keep the wires from getting too hot. Is this true? Ive handled x-mas lights before but I never knew they had lead in them? Im considering getting rid of the lights if theyre a serious safety hazard. I have them hanging up right now. Are they only hazardous if you handle them? Theyre not going to like rain down lead dust on me or anything are they? If you guys that have xmas lights can check and see if yours say the same thing, it would help. If this is normal for xmas tree lights and not especially harmful than I wont worry about putting up the lights. I just dont want lead dust falling down.