The 3D pulls 10 amps. If you plug into a 15 or 20 am circuit you will be fine as long as it is grounded. Either standard ground or GFCI. Either way, be sure not to overload the circuit. Check your breaker panel schedule and locate all the outlets on that circuit and check the appliance amps on all that use that circuit. Add up all the amps used if ALL items on the circuit as if they are on/in use. If the total exceeds the amp rating of the breaker, and you are energizing everything on that circuit, then a dedicated outlet might be in order. If the circuit is not fully utilized, such as only one other outlet in continuous use, just total up the amps pulled when the smoker is used.
Hope that helps.