smokin mama, I'd absolutely use the cast iron with the electric, and here's why...the cast iron'll hold heat, and help keep the temperature in the chamber stable between the 'on/off' of the electric thermostat (if the element's anything like an electric stove, it'll heat up to temp, then shut off, then come back on, and it doesnt' keep the temperature 'quite' constant. setting an electric oven at 350 means you're going to get temperatures between about 325-375) The cast iron'll help smooth that out a bit, and help keep your smoke production constant/consistant