Steve,
If we made smoke, the instructor would harp on us about our heat settings being too high and we're supposed to be toasting the wood. The woodburner machines that we used had temperature settings so we were able to adjust it as needed. So we didn't make smoke very often at all. Generally when it happened, the instructor did it. It was unintentional but we had 7 wood burning machines plugged into two surge protectors, probably all on the same circuit so it took higher temperatures when we were all working but when we turned our burners off, Orchid would "get all of the electricity" and so her settings that were okay when everyone was turned on suddenly became too hot and she'd get smoke.
Dani