Brush oil on the skin of the salmon if you are cooking them directly on the grill grates.
1 tablespoon Olive oil
Place the salmon fillets on the top rack of the Pit Boss with the skin side DOWN if they are skin-on. No need to flip during the cook. You can even leave them on the wire rack if you wish.
Mix the Cajun Blackening Rub Ingredients together well in a bowl.
2 tablespoon Paprika, 1 tablespoon Dark Brown Sugar, 1 tablespoon Dried Oregano, 1 tablespoon Dried Thyme, 1 teaspoon Cayenne Pepper, 1 teaspoon Kosher Salt, 1 teaspoon Course Ground Black Pepper, ½ teaspoon Celery Salt
After 1 hour of smoking, sprinkle and rub the blackening mixture over all sides of the salmon fillets.
Continue smoking the salmon, rotating occasionally, for an additional 1-2 hours, until the internal temperature reaches 110-115°F.