exactly like rich says, i had probs with temps on my gosm, this was before i found smf. constantly running high and smoker smokin like crazy. after some help from smf members i am able to control temp in my gosm pretty consistant. i have two vents on the side and those are the two i use to control temp. the top vent i keep open at all times when smoking. also dont use as much wood as the box holds, a couple pieces in there is all you need. just as long as there smoke, or if u even smell it. all u need, smoke billowing causes creosote to form on food which gives off taste.