I think it's Scotch specific, like a Scottish pipe tobacco that is naturally infused with what made Scotland famous.
Here's a quote from Goodejuice that may be helpful in linking the whisky/tobacco - the tobacco was steeped in (American) whisky barrels originally. (of course I think ECBlends has a "straight" whisky e-juice too if that's all the prospective vaper is really after).
Natural Perique, is naturally extracted from the real mccoy. This is not steeped chewing tobacco flavored with Perique Black flavoring, rest assured. Our Natural Perique is authentic from St. James Parrish Louisiana, No Bull. It is a perfect juice to appreciate on its own or combined with your other favorite tobacco vapes to add depth and flavor. Any pipe smoker, former that is, will recognize this flavor as the real deal. This unique curing process, for those who do not know, was first introduced by a French-American farmer who used the tobaccos that were being cultivated by the native Chickasaw tribes. The native tobaccos were packed tightly into whiskey barrels made of hickory and kept under pressure using screw jacks. Once a month, the farmers release the pressure from the oak barrels and re-situate the tobacco leaves. They are put under pressure again and this cycle continues for roughly one year. Our Natural Perique ejuice will give you that same fragrance and aroma that you used to enjoy, minus all the nasty chemicals that is.