it's not free and you need to buy pellets but the A-maze-n maze smoker is by far the easiest was to cold smoke IMHO, you can even use sawdust or pellets. it will provide hours and hours of cold smoke with no attention other than lighting it. i used a homebrew method that worked like the AMNMS using expanded metal but i went ahead and ordered the AMNMS yesterday. check it out, i'm sure you wont regret it.
...and no, i dont have stock in it. it's just a great product