New blog (car) smell comes from the chemicals used to set the dyes on the upholstery. That chemical is formaldehyde. The same chemical used to preserve dead creatures in jars and once used to preserve dead humans in coffins. New blog (car) smell is the scent of death.
I've only gotten through a handful of the Discworld books. When I start reading books within a single universe, I tend to read them in batches. But I rapidly get tired of Discworld after two or three books, and then I stop. I think I've been through two batches of the books.