Well it smokes wonderfully now. Idle and chuffing. It just needed more smoke fluid. Last night I added 20 drops (1ml). Let it soak in 10 minutes and added 10 more drops (.5ml) and let it soak in. Then another 10 drops (40 drops total at this point, 2ml) and it smoked ok for a few minutes and slowed down. I went ahead and shut it down. Today I added 20 more drops and let it sit for a few minutes to soak. It smokes great now. I think you would have to be super careless to over fill one of these modern fan driven smoke units except for the smaller smoke units GRJ mentioned.