eddy-turn, if you're not talking about a lot of smoking you can skip the tubes and slaved units by making a small smoke generator like this:
Then you can get some lump burning - or actually even use 4 briquettes. Once going place the can down inside your BGE that doesn't have lump in it place wood chips in the can. That will generate a low heat and lots of smoke for at least 30 minutes which is more than enough to smoke cheeses for instance. In order to keep it a cool environment you can also place a pan of ice cubes on your grate and then an auxiliary grate on it with the cheese.After your first use your shiny can will look like this.
BTW credit for these ideas go to Old Dave and Spring Chicken though I take license to the can design LOL!