As others have already stated, there aren't really any additives compared to what they put in cigs. With pipe tobacco there is PG and food grade addatibes for flavor in aromatics. Whereas in cigarettes there is ammonia and all kinds of disgusting chemicals that make them more addicting. If you need to kill time one day, look up "Modern Marvels Tobacco" on YouTube. It tells about tobacco production and the differences between cigarettes, cigars, and pipes. A vey enlightening series of videos.