Just by the way :) I have just been outside to read the naphthalene box...it has no breakdown of what it contains except to say contains 990g/1k naphthalene.It goes on to say it is safe to use clothing, blankets, etc and is also a pesticide:)
It says...do not ingest but if you do..drink milk and go to Doctor. There is no warning on it being a petroleum product. But our cars run on petroleum and those fumes would surely be more damaging than my little garden shed with a few naphthalene flakes in it.