Feel like real BBQ? Don't have a smoker? Don't feel like spending more than 10 bucks or so? Like Alton Brown? Here's how to make a very serviceable smoker out of a cardboard box and some other things you might have laying around the house.
This rig worked remarkably well. The biggest problem was getting the temperature high enough. You want to cook BBQ at around 225 degrees F. If you can't get your smoker up that high, you can still use it to smoke, then finish whatever you're cooking in the oven.
Step 1: Get a cardboard box
You need a box that's big. But not too big or you'll never be able to heat it up. My box is about 4 feet high, and two feed square. This is actually on the larger end of the size you want. Cut a hole in the bottom as shown, so that you can change the wood chips out during the cooking. Its a lot easier if you leave the bottom attached to use as a hinge.