I have anecdotes on the opposite side of the argument. I have friends who have played crazy amounts while unemployed (but they found time to look for work) and as soon as they got a job they went back to normal levels.

Personally I've played about 2 hours in the past 9 months (thanks Steam for tracking that), because I rank gaming lower in importance than work (which has been a lot lately) and offline social life, however if I decided to leave (or was kicked out of) my job, or even if I just happened to free up a bunch of time, I'd have no problem spending a few days playing solidly, but equally I'd have no problem going straight back to no gaming again. Is this an addiction? (I've been addicted to a few different things and based on those experiences I'd answer the question with a no.)