1: When you read all eight threads.
2: When you make an account and post on this thread.
3: When, at school, you hear the teachers telling the students to wear red and white for a school event, you imagine them wearing Reimu's outfit, with armpits and all.
4: You know you're not so addicted when you lose all your lives to Nazrin and Kogasa on EASY MODO. You are, however, addicted when the way you cure your rage (besides ragequitting) is by 1CCing IN.