Stir, strain into either a coupe, up, or an old fashioned glass with a large cube/sphere. Garnish with a lemon peel, expressed, if you like a lemon peel with your espresso (I don't).
For the Islay scotch, if you want a slightly less "ashy" taste (simulating the "cigarettes"), use Bowmore 12 Year; for more, use Laphroaig 10 Year. If not using the very bitter Bittermens New Orleans coffee liqueur, I would suggest using a quality coffee liqueur, infusing the rum with whole espresso beans (a few ounces infused in a 750ml bottle for 24 hours or more), and adding a dash of either mole or coffee bitters.
While there are other fine cocktails with a similar name, I was looking to create something that amped up the smoke and bitterness factor.