The installers may have left a small piece of styrofoam under an element, or some plastic wrap on the rack. Either one will smoke and stink.
Normally all electric ovens give off visible smoke when first fired up due to the factory coating put inside the cavity for anti-corrosion purposes. The User Guide
even mentions that smoke is normal the first time and I recommend that you run any new oven in Bake at 450 degrees for 10 minutes to bake off the cavity coating and burn in the elements. GE would have you speed up the process by running a 3-hour self-clean cycle, but that is an extraordinary waste of power.