California (P65 warnings) is one of the largest list of materials that have been known to cause cancer. The manufacturer of these diodes list two items that are on the P65Warning list, namely Nickel and Carbon Black. Nickel is a part of the alloy used in the leads of the device (Nickel/Iron/Copper) and Carbon Black is used in the molded body of the device. The carbon black is a real reach, as the warning lists the hazard as 'airborne, unbounded particles of respirable size'.
Electronics is a messy and hazardous career choice as there are a lot nasty chemicals in use. Always be safe.
