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You're addicted to Mass Effect if you play every chance you get until you wake up drooling on your controller

"I am Commander Shepard, and this is my favorite store on the Citadel."

Every single time in the game when Shepard is introducing himself to somebody starting with "I am Commander Shepard." I have to finish it with "and this is my favorite store on the Citadel."

When you make your pen name have one of the names of the game's characters.

Haha yeah I guess that only applies to Commander Shepard, savior of the Citadel.

How bout having brief conversations with your friends that usually go like this, only with their names. "Shepard." "Wrex."

When you put up with her as a boss...I mean...holy crap...you guys have no ideas the nightmare it is (love ya boss...lol)
kidding kiddoes, she's a cool girl

If you wake up with an origami in your hands in a dark wood with book pages around you,with a Scofield revolver "six shooter" and your trusty horse with you for a dual against Noel Vermillion wearing a N7 spacesuit a while you hear Leliana sings a sad song thinking biggrin amn I hate mining...OH NO, ANOTHER GAME WITH SPACE MARINE THAT HAS MINING IS COMING OUT SOON!
(ok, try to name all the games I made reference to)
lol

That, or simply if you clock over 300 hours on the first game...and 120 hours so far in the second

You know you're addicted to Mass Effect if- ASSUMING DIRECT CONTROL.

You know you're addicted when you're talking to someone, you wait several minutes after they say something to you so that you can look over dialogue options and decide which one to choose.