Quite a few.

As I was finishing high school, I was gifted a book by a prominent politician in my country that promoted climate-change denial. I actually believed it for a while.

However, as I got out of that, my late stepfather went down an esoteric and far-right rabbit hole. I looked into what he read to be able to critically engage with him. There was fake-historian punditry, edgy eugenics, Russian mysticism and for example trash fantasy that has a cult around it (a bit like scientology).