Most people I know have some sort of addiction, though it usually isn't to an actual drug. It's that thing that you *know* you shouldn't let yourself get back into, because your friends and family may not see you for months. The thing that you will spend far more money on than you intended to.
For me, it's changed over the years. First it was World of Warcraft. Then it was Minecraft. For awhile, it was Hearthstone (goddammit, Blizzard). What is it for you guys?