Perfume/fragrance mostly! My go-to ones use patchouli. And I have a little oil roller to apply a spot to my wrists if I feel a bit frazzled.

Having the Kindle app on my phone helps a lot but the biggest thing is unlearning being a book snob. They don't have to be heavy, important literature. I just have to enjoy them. Also I'm not scared to DNF if I'm not having fun.