Preheat your pellet smoker to 225°F.
Rinse the smoked haddock fillet with cold water and pat dry with a paper towel.
Drizzle olive oil on both sides of the fillet.
Sprinkle the seasoning mixture over both sides of the haddock fillet.
Place the haddock fillet on a grill mat and put the mat on the smoker grates.
Close the smoker lid and let the haddock smoke for 45-60 minutes or until it reaches an internal temperature of 145°F.
Once the haddock is done, carefully remove the grill mat from the smoker using heat-resistant gloves.
Let the haddock rest for a few minutes before serving.
Enjoy your delicious smoked haddock!