All religions have periods in their history which are looked back to with retrospective fear and trembling as eras of persecution, and each religion has its own book of martyrs.
One of my last few vices is coffee, but with a spot of almond or soymilk, it's never tasted better!
Maybe philosophy - I love talking about ideas. Or maybe art history. I was thinking about psychology, then I got really afraid because everybody says it's terribly boring.