Find this document while searching about tobacco casing. Might be good for someone trying to find the basic to blend cigarette tobacco. Fascinating, it says here that classic virginia blend does not have any casing except for water. It also include the percentage of stem used in commercial cigarette blending, which may be good I think, I always throw out stems, but this document make me think about using it as filler. Anyway, here is the document. I hope it is not shared here before.
https://www.industrydocuments.ucsf.edu/tobacco/docs/#id=hzbw0213
https://www.industrydocuments.ucsf.edu/tobacco/docs/#id=hzbw0213