When does "addiction" cross over in to "serious problem"?

Wherever that line is, there's a very good chance that my D&D habit is approaching it, if not leaving it choking on it's own dust miles ago. Here's a warning for you: this post will feature a lot of geekspeak. Abandon hope, all ye who enter here....

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For over a year now, I've been part of a D&D group with a mostly-continuous membership. We have Steev as the DM, and the only original players left are his fiancée Megan, and me. When we started, there was another guy, but his girlfriend's joining-and-then-getting-pissed-about-the-rules caused him to leave. Still, they have a statue of an auguste clown that kind of looks like him, so it's like he's still in the group!

I've mentioned them before, but our other two current players are Beau (someone I didn't know initially, but who joined at the same time as the departed player's girlfriend) and Daniel (an old friend who is probably a little more nerdy than me), and that's been our group for a while now. Close to half a year, I think. Our quest is going awesome, even if our players have been in the same area FOREVER -- part of that because we didn't play for a couple months.

If you're a D&D player, especially if you know much about 4e (fourth edition), here is our character layout:

• Megan: Githzerai Psion, Time Bender paragon path. Her whole idea behind the character was wanting to go all "timey-wimey". She's sort of become an adoptive mother to what might be a five-headed killer dragon goddess.
• Me: Longtooth Shifter Avenger, Hammer of Judgment paragon path. I've always liked wolves/werewolves in fiction, and longtooth shifters are descended from them. Plus, Avengers are like a (more) violent version of paladins. They exist to smite their god's enemies. My character worships Bahamut, but Bahamut might have died during our adventure so far. I'm not 100% sure.
• Conrad (the lost player): Dragonborn Paladin of Bahamut. Our DM threw in a variant of his character as an NPC since we all miss him, but he's been gone for a while now.
• Beau: Tiefling Swordmage, and I don't remember what he went for with his paragon. Tieflings are descended from demons, and so Beau's character is similar to mine: high HP, and some pretty significant damage potential. We refer to ourselves as the tanks of the group.
• Daniel: Razorclaw Shifter Monk, hasn't hit paragon yet. His kind of shifter is descended from werecats, so we have some fun like throwing him in to large bodies of water. And while his monk is very much of the "must be up close" type, he still gets some pretty decent damage in. Plus, he forces enemies to move a lot.

That's what is in store for me tonight. We are working our way through the Pyramid of Shadows adventure that Wizards of the Coast put out, and having a lot of fun on a regular basis. We always keep in mind the essentials for a fun D&D session: we bring/make food and snacks, we keep it light between players and serious between characters, and Steev makes sure to remind everyone of the most basic rule of D&D: "You can always kill Justin."