Preheat the oven to 450 degrees F. Line a baking sheet with parchment.
Roll out each dough piece on a lightly floured surface into a roughly 5-inch square. Space them evenly on the prepared baking sheet.
Place half a chocolate bar on each square. Top each with a quarter of the graham cracker crumbles and 1/2 teaspoon smoked salt. Fold in the opposite corners so that all 4 meet in the middle, then pinch the seams and middle to seal.
Mix together the sugar and cinnamon in a small bowl. Brush each pocket with butter and sprinkle with the sugar mixture. Bake until golden, about 10 minutes.
While still hot, top each pocket with a marshmallow, pressing slightly to adhere. Use a kitchen torch to toast the marshmallows. (Alternatively, turn the oven to broil and broil, watching carefully, to toast the marshmallows, about a minute.) Serve warm.
Propane gas torches are highly flammable and should be kept away from heat, open flame and prolonged exposure to sunlight. They should be used only in well-ventilated areas. Follow torch manufacturer's instructions for use.