I have revived most of my smoke units. As Ghost@amps1 said, remove the top of the smoker. Make sure the filament wires aren't broken first of all. I then replace the cotton in the smoker, give it about 7 or 8 drops of smoke oil and reassemble. It should work. I've also found that at times I will only get smoke from one pipe (Tiger, Pershing) so I will get a soda straw and blow into both rubber hoses and it will now produce smoke from both hoses, pipes, etc.