Dave, the smoke generator plug is programmed under lock code 166, as "R1" and R2." You set which program step you want it to come on at, and set the parameter to "1," or "0" for Off.
So, say you were smoking jerky, and want the fan to automatically come on during step 2. I smoke jerky at 140 for 2 hours, with no fan, and then turn the fan on. I could set C01 140 e01 t t01 2.0, then C02 140 e02 t t02 6.0. Then, I would go into lock code 166, and set R1 to "2" with parameter "1" for On. I would set R2 to "0" with parameter "0" for Off. Make sense?