Right now I'm smoking a mix I made up that consists of IQ, Mild Burley and Dunhill 965, sometimes with a pinch of Perique. I'm real new to pipe smoking so I don't know much about what-all is in the IQ and the 965, but I have the feeling that IQ is treated with some sort of chemical preservative. If anyone know if this is true or not I'd sure like to know. In the meantime, I'd like to search for tobaccos that are as natural as can be. I know there's a heck of a lot of pesticides and other chemicals applied to growing tobacco, but any help in steering me to sources of tobacco and blends that at least aren't treated with synthetic chemical preservatives would be greatly appreciated. Thanks.