Obsessions.

Drugs, alcohol:
These things are absolutely okay if taken moderately. I mean, I don't have anything against them. But they shouldn't control you. And you shouldn't get addicted.
I am not one of those people who have always dreamed of getting sloshed/stoned when they grow up. It's not on my wish list, not entirely. Like, I can try them out if I have to, but my life doesn't depend on it. :/

Religion:
Religion is bullshit. If you disagree, well.. GO DIE. :)
You can read this post for elaboration - Godlessness.