This white haze certainly doesn't hurt. The white haze can occur due to the use of the dishwasher. Wash the casserole by hand.

Accidentally consuming particles of the coating from the pan is not damaging to your health.

An induction hob's coil needs a minimum surface area in order to switch on. That's why it is important that the base of the pan is the same size as the cooking zone. If the zone used is too big for the pan, the hob may not be able to locate the pan and won't switch on.

You can find it here.