So an update on what I found... 5 mins after I got up on the roof and I could see a little smoke and witin 10ft I could smell normal woodsmoke odor. 15 mins later I ran back up and I was able to smell it when I held my head over the chimney. Very faint smoke. 45 min semi heavy white smoke that felt moist when I put my hand in the vapor. Still slight odor ( I am standing 1 hr I checked again and there was just the heat shimering. The exhaust does have some odor but I nearly have to stick my head in the chimney. It is smokeless until it goes out. This is with burning wood that average MC of about 25%. (I know not ideal) This fire was started with a cold chimney so it took a little while to warm things up. Normally I burn 2 fires a day and everything is still warm.