At 65%, the alcohol is a solvent. It will strip the moisture from your lips. It will numb your tongue after one sip. You cannot taste the "whisky" because your pain receptors are too busy signaling an emergency. The smell is sharp, stinging the nostrils like smelling salts.
Do not be afraid of high ABV, but do not worship it either. A perfectly balanced 46% whisky (like Bunnahabhain 12) is a better daily drinker than a rough 60% bourbon. However, a 40% whisky is rarely a great whisky. The alcohol percentage is the volume knob of flavor—turn it up to 46, but avoid the distortion of the red zone. whisky alcohol content percentage
This is the Goldilocks zone. It provides enough alcoholic energy to volatilize the aromatic compounds into your nasal cavity, but not so much that it numbs your palate. If you see a bottle at 46% and NCF on the label, buy it. The Deep End: 50% - 55% ABV – The Enthusiast’s Frontier This is the realm of "Cask Strength" whiskies. The distiller has taken the whisky directly from the barrel, added little to no water, and put it in the bottle. The ABV here is a snapshot of the climate: in Scotland (cooler), cask strength is often 50-60%; in Kentucky (hotter), bourbon can exit the barrel at 65-70%. At 65%, the alcohol is a solvent
