Ah yes, Jay's thread, if you like Lakelands like me it is bookmark-worthy!
On point, my only attempts to flavour tobacco with tobacco is mixing MacBaren's vanilla cream (called Classic in the EU) 1:1:1 with a local company's straight Burley and Virginia, I found the mix is better than the sum of its parts.
I will be attempting to flavour my homegrown burley with tonka beans though, hopefuly will get some of the taste coming through. I remember a thread by
@ChinaVoodoo in the pipe forum that very little of the natural materials' flavour comes through unfortunately.
I suspect tonka is very effective because deerstongue is quite good in miniscule amounts.
The ingredients I'm most skeptical of are beverages like whiskey and rum, and coffee, and anything fruity. It takes more rum by weight, than tobacco to really notice it for instance, so when a tobacco company says anything like that, it's most assuredly not actually what they say it is.
I'm experimenting with essential oils atm. So far, I've concluded a couple things. I'm not sure how helpful these discoveries are so far, but I thought I would share anyway.
Vitiver is disgusting.
Rose/Geranium at 2.5% weight in a blend smells crazy strong but tastes balanced.
Real 9% rose oil(non geranium) at 0.75% in a blend has a nice tin aroma and is subtle and hardly 'noticeable' in the smoke.
A similar amount of neroli is less recognizable as a flavour you would identify, and blends well with vanilla.
Deerstongue leaf is good at amounts between 1 and 3%.
Alcohol based vanilla extract at 50%w/w in a blend is noticeable 200% baker's weight is too much, but can be used as a blending component.
Grape molasses is totally superior to molasses molasses. 30g cigar trimmings plus 12g grape molasses plus 15g of a sour wine has a balanced pH when you smoke it.