Crockpot Shredded BBQ Chicken

3-4 chicken breasts
12 oz. BBQ sauce, separated (I use Sweet Baby Ray's)
1/4 C brown sugar
2 Tbl Worcestershire sauce
1/4 C Zesty Italian dressing
1/2 tsp. liquid smoke

Using about 1 Cup of the BBQ sauce, place all ingredients in a crock pot, and let cook for 4-6 hours.  Remove the chicken, and shred with two forks.  Remove about half the liquid left in the pot, and set aside, in case you need it for consistency.  Return the chicken to the pot, and mix.  See if you need more liquid and/or BBQ sauce.  Add until you get the taste and consistency you want.  Serve on slider or hamburger buns.