Well, Ive been addicted to games before but ao was my first and is my only MMOG. I've never been as addicted to anything in my life since I used to go havin it large (TM) in Ibiza and UK clubs :p
These days, however, my unique playing style ie... not playing but talkin to people n stuff is taking its toll and in catchin up with playing and progressing, I'm slowly losing my addiction or at least the sparkle I used to have for this lovely game.
Apart from cigarettes and sex (not necessarily in that order), I have no other addiction