Boil the pasta according to package directions. Drain. Do not rinse. Drizzle with 2 tablespoons of olive oil. Set aside.
In a medium skillet, heat two tablespoons ofolive oil over medium heat.
Add celery, bell peppers, and onions and saute until vegetables are tender.
Stir in barbecue sauce, tomatoes, and chicken. Stir and bring to a low boil.
Simmer for 2 minutes to let the flavors meld together.
Plate the pasta and top with chicken mixture. (Or mix it all together.)
Serve Barbecue Spaghetti with Smoked Chicken sprinkled with cheese and green onions.