In a small bowl combine fajita seasonings: garlic, cumin, chili powder, smoked paprika, onion powder, brown sugar and salt.
Mix 1/4 fajita seasonings together with olive oil and orange juice in a shallow dish.
Add whole chicken breasts to marinade and turn to coat all sides.
Cover and refrigerate up to 4 hours until ready to grill.
Slice peppers and onions thin. Toss with 1/4 cup olive oil and 1/4 cup of fajita seasonings.
Prepare a grill fire to 300° with pecan or hickory wood for smoke.
Place chicken over indirect heat.
Put a grill pan over indirect heat and add vegetables, spreading evenly.
Close the lid and cook 10 minutes.
Stir the vegetables and turn the chicken breasts. Close the lid and continue to cook until internal temperature of chicken reaches 165°.
Remove from grill and allow chicken to rest 5 minutes before slicing.
Serve thin sliced chicken on flour tortillas with fresh lime slices, cilantro and salsa.