Preheat your smoker to 225°F.
In a large bowl, combine the olive oil, brown sugar, smoked paprika, garlic powder, onion powder, salt, black pepper, and cayenne pepper. Mix well to create a rub.
Add the chicken thighs to the bowl and coat them evenly with the rub.
Place the seasoned chicken thighs in the smoker and pour the peach whiskey over them.
Smoke the chicken for about 2 to 3 hours, or until the internal temperature reaches 165°F.
Once cooked, remove the chicken from the smoker and let it rest for 10 minutes.
Shred the chicken using two forks.
In a small saucepan, combine the barbecue sauce and peach preserves over medium heat, stirring until warmed and well mixed.
Toss the shredded chicken with the peach barbecue sauce mixture until fully coated.
Serve on buns or with your favorite sides.