Slow Cooker Smoky BBQ Pulled Pork Sandwiches

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3 pounds pork roast ( 3-4 pound pork shoulder butt roast or tenderloin )
3 tablespoons paprika
1 1/2 tablespoons salt
1 1/2 tablespoons black pepper
1 teaspoon garlic powder
1 teaspoon dry mustard
1/3 cup liquid smoke
16-32 ounces  barbecue sauce
8 hamburger buns

Spray the inside of slow cooker with non-stick cooking spray (or use a slow cooker liner). Combine paprika, salt, pepper, garlic powder, mustard and liquid smoke in a small bowl. Rub all over the roast, covering all sides. Place lid on slow cooker and cook on low for 8-10 hours (or high 5-6 hours). Shred meat when finished and add bottle of BBQ sauce. Serve on buns with coleslaw.