You ever crack open a library book and it smells like crap or something? Or after a while the recycled material used for your coffee cups sleeve when wet starts to smell like crap? You know what else smells of crap? The chocolate in M&Ms and the like. All the candy fiends and sugar addicts won’t agree and I get it. But they are “mother nature’s turds” as Anna Vocino once said. Stick your nose in a bag of Hershey’s Kisses and take a whiff, a resemblance of shit de toilette. Don’t taste it because the sugar will likely hijack your senses. The smell maybe has to do with stuff called indole.
“Perfumers add it to flowery fragrances, but it’s also added to chocolates, coffees, and fruity-flavored sweets. That doesn’t sound bad—until you learn that concentrated indole smells like poop. Because it’s actually found in poop.”
See Why is a Compound That Smells Like Feces Put in Perfume And Chocolate?