I disagree unless its a drugstore blend. Much of it is a spirit(carrier), spices (like tonquin for an English blend) or, vanilla, cocoa, ginger, rose water, cinnamon-things to bring out the natural tobaccos. No, real pipe tobacco is not a chemical bomb. Gawith and C&D explain this. Yes PG is an additive they use. Even hand-rolled cigars have natural processing. This all started with a way to keep tobacco moist and stable on ships for long voyages, casing them in spirits and spices.