A friend of mine has type 1 diabetes, for which she injects a synthetic insulin called Humalog. When she does, there's a quick but very powerful aroma of... Band-Aids. It's weird. I never thought much of it, until the last time I had a peaty glass of scotch, a drink I've never particularly loved. As I took my first sip, I thought, as I always do, that it smelled like... the same Band-Aids. A quick poll of PopSci editors revealed that I wasn't alone in associating the smell of scotch with non-food: others thought of Sharpies, hospitals, and wood stain. Why would scotch, a drink beloved by many for centuries, remind people of things that are so thoroughly not delicious? As it turns out, the resemblance is not at all a coincidence.