Recently I fond some interest on flavored instant coffee from brands like Nescafe and other brands. Flavors as Hazelnut, Caramel, Vanilla, Toffee as such are quite attractive, but since I am on sugar restriction I wonder from these "Artificial" or "Natural" flavors as say in the Ingredients description have any added sugar contents to it to enhance the flavor.
Check the ingredients and nutrition facts on the package. Particularly carbohydrates. Coffee and artificial sweeteners have no carbs, so if you see carbs, it's probably all sugar. Generally the answer is yes, they have added sugar. That's how they make flavors like those you mention taste so sweet.