Never expected to see a cooking question in here with all the battery acid and fuel smells.
You can make a cold smoker with a cheap pencil type soldering iron, a bean can (clean preferably), and your favorite wood chips. Use any container as the smoke house, an old grill, or turn a cardboard box over it all.
Take an empty bean can and punch about 3 pencil size holes near the top equally spaced.
Poke a hole through the bottom so the soldering iron will fit through it snugly with the tip fully inside the can.
Insert soldering iron, drop in wood chips (dry, not soaked), plug in the soldering iron, and place the can's lid on. Our can opener cuts the seam of the lid, so it will fit back on fairly nicely.
If you have enough room to keep the can a few inches away from under the meats, that will help prevent heat getting to the meats also.
I have not tried this yet, but have read on the internetwhere others have successfully used it . So I has to be true.
It is on my list of things to do, because I like cooler smoke temps on my meats before adding the heat to cook and finish them.