Start by preparing the pineapple. Using a sharp knife, preferably longer than the pineapple is wide, cut off the top and bottom.
Then slice off the skin around the body of the pineapple. You don’t need to cut very deep to remove the skin.
Slice the pineapple now into half inch thick slices. You can go thinner, maybe down to a quarter inch thick if you prefer it. Then cut out the centers of each slice to remove the core. If you have a de-coring tool you can use it before slicing.
Lay out the pineapple in a Pyrex bowl. Try to keep the size of the bowl not much larger than the available pineapple, as you don’t want to waste a lot of Fireball trying to submerge the pineapple.
Pour the Fireball over the pineapple. You may need to use more if the pineapple is not well covered. My top layer of pineapple just touches the Fireball, and it worked out fine. Cover the Pyrex and gently shake it. Let it rest in the fridge for at least 30 minutes.
Preheat your smoker to 250F. If you’re already smoking something else at anything above 200F, you can just add it to the smoker. Smoke the slices for 30 minutes to 1 hour, then enjoy.