It might gunk up a coil but I would be curious if you took like 29 ml of PG/VG mixture and added 1 ml of your favorite scotch to it and then let it breath and steep for a few days. Who knows, might be an awsome vape that would be worth rebuilding the coils every few days.
Well, since you brought it up...
I'm just spit-balling here. It seems to me that if there is no commercial flavor, attempt to reduce scotch to a concentrated level, mix with PG and use as a flavoring. Unfortunately, typical DIY doesn't have access to pro tools like Roto Evaporators and the like...ending in really harsh and inconsistent flavor. Be a good project if someone had the time though...
The 'Bathtub Scotch Flavor' method:
Gently evaporate the alcohol off the scotch. It goes away at around 140 degrees.
You are then left with a known amount of scotch flavored water.
Reduce scotch flavored water by .75, leaving .25 concentrated scotch flavored water
(quality unknown).
Mix with 3 parts PG.
Steep several days, test, (possibly gag), learn, refine...lather, rinse, repeat.
I think the end sugar ratio would make it gunkier than a badly filtered NET though...Wait, is there sugar in Scotch? Yes, 100-500 mg per liter. Mostly Fructose and Glucose.