Wiring and connectors and some rtf kits are coming with that cancer warning now. I'm told that a lot of the plastics used in China where these rc products are made use cancer causing materials during manufacturing. The reason CA has the warning is that the feds are too lame to protect the public from hazards so its up to the states to do so and only CA spends the big bucks to research these things. I wish a scientist would chip in and let us know how serious a problem this is.