Hello, I would classify myself as a Beginner as I've only smoke a handful of times. I have a vault propane smoker and I've noticed this happens every time I smoke. What happens is when I smoke ribs for example, I put hickory or apple or mesquite chips in the bottom tray and it really smokes well, like a good amount of puffy wood smoke is produced. Then after about maybe 30 minutes the smoke amount really tapers off. I add more chips and still don't get anywhere near as much smoke as at the beginning. I'm not soaking the chips or anything like that and I keep the heat around 210 degrees. Does this sound familiar? Am I doing something wrong. Thanks for any pointers.