I have a deep and pathological obsession with trees and plants.
There's a lot of obsession about people's personal ambitions.
We've always had a sadistic obsession with technology.
Yet another thing Canadians and Europeans have in common is an obsession with the United States, and with distinguishing themselves from it, often by crude stereotyping.
I like sweaters. I have a sweater obsession, I guess.
I have an obsession with books about kids with Asperger's syndrome.
For me, I was never really obsessed with Luke Cage. My obsession was Wolverine.