As long as the coop doesn't catch fire you should be okay. The trick is to keep the fire hot and it will smoke a lot less than a cool burning fire. I am thinking that if there is a lot of smoke vlowing right at the chickens then the birds could actually be gassed. It's not likely, but common sense isn't a bad idea when playing with fire. This is coming from a woman that has hunted moles with gallons of gasoline, and had the kids help light the holes. The camper that was used as a chicken coop is still the best bonfire I a ever seen, even the llamas were in awe. 2 days later all that was let was about 300lbs aluminum and miscellaneous stuff. Homeschooling at my house was a lot of fun.