The first time most people taste Laphroaig, the reaction is not subtle. Iodine, campfire, seaweed, wet bandages, brine—it can read less like whisky than like a beach bonfire that caught fire next to a hospital. You either recoil or fall instantly, permanently in love. Either way, one question follows: why does this stuff taste like smoke? The answer is a soggy brown fuel called peat, and the tiny Scottish island of Islay is soaked in it.
It starts with the barley (and a fire)
Before barley can become whisky, it has to be malted—germinated, then dried to halt the process. How you dry it changes everything. Most distilleries use clean hot air. But on Islay, tradition dries the barley over fires fuelled by peat: partially decomposed vegetation, cut from the island's bogs and dried into bricks that smoulder rather than burn.
That peat smoke is dense with aromatic compounds called phenols, and as it drifts through the drying barley, those phenols cling to the grain. They survive fermentation and distillation and end up in your glass as that unmistakable smoky, medicinal, maritime character.
Why Islay peat tastes the way it does
Not all peat is equal. Islay is a small, wind-battered island in the Atlantic, and its bogs are built from coastal, salt-soaked, seaweedy vegetation. That's why Islay smoke carries those distinctive briny, iodine, and seashore notes you don't get from the more earthy, floral peat of the mainland or the islands to the north. The island itself is in the glass.
What is PPM, and does a higher number mean smokier?
You'll see peated whisky rated in PPM (phenol parts per million), measured in the malted barley. Lightly peated malts sit around 5–15 PPM; heavy hitters like Ardbeg and Laphroaig run 40–55+; and Bruichladdich's Octomore has crossed 300. But PPM is measured before distillation and maturation, both of which soften and reshape smoke—so a higher number hints at intensity, not a guarantee of it. Two 50-PPM whiskies can taste worlds apart.
The plot twist: not all Islay whisky is smoky
Here's what surprises even seasoned drinkers. Islay is famous for peat, but the island also makes excellent unpeated whisky. Bunnahabhain built its reputation on a largely unpeated, sherried, maritime style, and most of Bruichladdich's core range is unpeated too. If you love Scotch but not smoke, Islay still has a pour for you—it just won't be the one your smoke-obsessed friend keeps pushing across the bar.
Our take: smoke is an acquired taste, and it's worth acquiring—but do it in order. Start gentle (Bowmore, Caol Ila), work up to the big medicinal Ardbegs and Laphroaigs, and keep an unpeated Bunnahabhain around for the nights you want Islay's soul without the campfire. Peat rarely converts on the first sip; it converts on the third.
Frequently Asked Questions
Why does Islay whisky taste smoky?
The malted barley is dried over peat fires before distillation. Peat smoke is rich in aromatic compounds called phenols, which cling to the barley and carry through into the whisky as smoky, medicinal, and maritime flavours.
What does PPM mean in whisky?
PPM stands for phenol parts per million, a measure of the peat compounds in the malted barley. Lightly peated whisky is around 5–15 PPM; heavily peated Islay malts run 40–55+. Because distillation and ageing soften smoke, PPM indicates intensity but doesn't guarantee how smoky the final whisky tastes.
Is all Islay whisky peated?
No. Islay is famous for smoke, but Bunnahabhain and most of Bruichladdich's core range are largely unpeated, showcasing the island's maritime, sherried side. If you love Scotch but not smoke, Islay still has plenty to offer.
What is the smokiest Islay whisky?
Bruichladdich's Octomore line holds the record for peating level, frequently exceeding 100 PPM. Among widely available bottles, Ardbeg and Laphroaig are the most intensely smoky and medicinal.