I don't give percentages for tobacco because I don't use it. I do think for the most part, with tobaccos it tends to be the dominant note, so start small as you combine you can always add more, etc.
With the apple pie, oddly enough, I kind of could see tobacco as the accent note, and the pie doing most of the work. But, that's just me, and honestly I'd say experiment, starting small and allowing for a few days of a steep, and then if needed, bumping up percentages of other flavorings until you are satisfied... Just generally, it's so much easier to deal with a mix that is slightly under flavored than diluting the mix. I really really dislike when my DIY creations wind up needing dilution instead of a few drops more of flavor. It happens, but it's not usually my favorite "event" to deal with.
Best of luck,
Anna