A while ago I had some of the Classic English blend that Segar&Snuff in Covent Garden sells, that went a bit dry.
I decided to try something different to remoisturize it, so I put it in a jar, sprinkled about three drops of Talisker on it, mixed it as good as I could, and left it in the jar for a few days, shaking the jar every now and then. Then I had to leave the jar opened for another day or so for the alcohol to evaporate, and now I have a nice Classic English with a delicate hint of whiskey.
I know, sprinkling drops on the tobacco is not optimal. There was a lump of tobacco that had most of the "in your face" flavour, whereas the rest of the jar only has a hint. Next time I would try spraying the flavouring, if I do this again. But it definitely can be done, and it definitely works!