As this video shows, there's a better way. It's called the snake method, which entails a double-line of coals wrapping around the outside of the kettle. Lighting one end causes the coals to burn around in a circle and, if done correctly, it's possible to maintain a low temperature in the neighborhood of 200-225 degrees for 8-10 hours or more. By varying the size of the snake, both in terms of length and width, you can get hotter, longer burn times as well. It takes a little practice and experimentation, but once mastered, the snake is one of the best methods for smoking on a Weber kettle or PK Grill.