The FDA's tobacco regulations require the manufacturer to identify to the FDA a pipe blend's ingredients. From the FDA's guidance doc on this requirement (
https://www.fda.gov/media/101162/download), the manufacturer must, for example, identify the leaf type (e.g., burley, bright,oriental), variety, cure method (e.g., flue, fire, sun, steam, air) and heat source (e.g., propane, wood) and a description of any recombinant DNA technology used to engineer the tobacco. The manufacture must also ID added chemical and complex compounds like flavoring. I don't know if these ingredient lists are available to the public. I suspect not.