Whisk tamari, nutritional yeast, maple syrup and liquid smoke together in a bowl or small measuring cup.For thin bacon strips: turn tofu on it's side, and begin slicing with a cheese slicer. Lay strips in a baking dish, and pour marinade over them.Cover and marinade for at least an hour.For chunkier pieces: Slice tofu into slabs with a large knife, and then into 1 inch strips. Lay out in a large baking dish, and pour marinade over them. Cover and marinade for about 2 hours.When you are ready to cook tofu bacon, preheat oven to 425*f. Remove tofu from marinade and lay out on a baking sheet lined with parchment paper. Brush or spritz with oil and bake for 15 minutes. Remove from oven, flip strips over, spritz with oil and return to oven for another 10 minutes. Tofu will crisp up a bit more when you take it out.