Smokebuzz sorry to correct you man but I just have to set the record straight on this one, and being an electrician for 14 years, a contractor for 9 and now a vocational instructor I think I'm qualified to answer this one.
A GFCI or GFI are the same thing. Ground Fault Circuit Interrupter, everyone just started dropping the circuit to make is shorter to say. A GFCI will work if you have a grounded plug or not, and will even work on old 2 wire non grounded house wiring systems. They are available in either breaker form or single outlet form. What a GFCI does is measure the amount of current flowing out to a device and flowing back in from a device. Now if that current measurement varies move that 30 mille amps it trips off. It doesn't care if that current is flowing back threw the ground wire or flowing back to ground threw your body and directly tot he earth. They are now required in all outdoor, unfinished areas, garage, and all counter top area regardless of location. Before they only had to be 6 feet from a water source on a counter top.
They are a life safety device to prevent you getting shocked. Hope this clears things up. And yes if you are using your smoker outside or in the garage it should be plugged into a GFCI outlet. they do make portable GFCI extension cords that are short that you can plug in first or have a QUALIFIED electrician change out the outlet if you don't fell comfortable doing it yourself and make sure the polarity is correct.