We just had a Vermont Castings Defiant installed a coupla weeks ago. Everything is warm and cozy inside, yet when I went outside the other day I noticed a significant amount of smoke coming from the chimney - enough to make it look like there was a leaf fire on my roof. After playing around a bit, I realized it smoked this much when the damper was closed. I thought this was a very efficient stove (though it's noncatalytic). I am quite confident that we are burning good, seasoned wood. It's possible that Im not lighting the fire correctly - although I'm building up a good amount of coals before I add more wood and close the damper. Could it be that I'm not putting enough wood on the coals to keep it up - usually I put a coupla BIG logs on them. I have also tried opening the air intake more, and less. Any suggestions or insights?