Thanks to a post by Cortez, I read this blog post on blending tobacco by Russ Ouellette, and think it'll be great reading for others. (It was published in 2010, so before some of us found the forum)
LINK to article.
And here is a second article by this master blender:
LINK to article.
LINK to article.
And here is a second article by this master blender:
LINK to article.