For quite a few years I managed the utilities dept. for Pulp and paper mill. We produced steam at 800# and 750 degrees. We constantly monitered the "quality" of the steam in terms of how much sodium and misc. other chemicals were in it. Now these measurements were in the parts per million, so very small. In a wood kiln drying process the steam temperature will be much less and in all likelyhood will have a greater amount of "boiler chemical" carryover. So BigAl is correct. Whether or not these are something that would affect the smoke flavor is going to be very subjective.....Dick