Can someone tell me why...

...some books smell like tobacco? I don't mean the ashtray-scented books that come from smoker's homes, but brand, spanking new books straight from the bookshop than give off a smell similar to a newly opened pouch of fresh pipe tobacco.

It's kind of a nice smell (it reminds me of my grandfather who used to roll his own cigarettes using pipe tobacco), but it seems to me it doesn't belong in books, and I have only ever smelled it on new or new-ish hardcovers.