Here are more reasons to read the wrapping. 
Cocao powder ,and imitation , or natural vanilla, are often used to reduce the cost of making a chocolate bar. Cacao powder is used in baking a lot to intensify the chocolate flavor. What ever your tastes, artificial,synthetic or imitation flavorings are manufactured flavorings. Some prefer their flavor. They are not FDA classified Vanilla made from vanilla beans and alcohol. These artificial flavorings have been around , according to several published reports for some 80 years in many products. It is fun reading about artificial flavorings. One example: National Geographic.Voices. October 1, 2013, "Beaver Butts Emit Goo Used For Imitation Vanilla."