In a large bowl, whisk together flour, sugar, and salt. Using a pastry cutter or your fingertips, work the cold butter into the flour mixture until it resembles coarse crumbs with some pea-sized pieces remaining. Gradually add ice water, one tablespoon at a time, mixing gently until the dough just comes together.
Form the dough into two discs, wrap in plastic, and refrigerate for at least 30 minutes.
While the dough chills, cook your bacon until crispy but not burnt. Drain on paper towels, then chop roughly once cooled. Reserve 2 tablespoons of the bacon fat.
In a large bowl, toss sliced apples with lemon juice to prevent browning. In a separate bowl, combine brown sugar, flour, cornstarch, and spices.
Pour the sugar mixture over the apples, along with the reserved bacon fat and bourbon (if using). Fold gently until every slice is coated.
Fold in three-quarters of the chopped bacon, reserving the rest for the top. Let this mixture stand for 15 minutes.
Preheat your smoker to 250°F. Roll out one disc of dough to a 12-inch circle and transfer to a 9-inch pie dish.
Fill with the apple-bacon mixture, mounding slightly in the center. Roll out the second disc and either place whole on top or cut into strips for a lattice pattern. Trim and crimp the edges decoratively.
Brush the top crust with egg wash and sprinkle with turbinado sugar and a light dusting of flaky salt.
Place the pie in your preheated smoker and cook for 75 minutes, or until the filling is bubbling and the crust is deeply golden. Use apple or cherry wood chips for smoking, and rotate your pie halfway through cooking.
Allow your pie to rest for at least 30 minutes before slicing.
Sprinkle the remaining bacon pieces over the top just before serving.