Similar story, been playing this thing from when I was 18, it did have some negative impact on my studies, but once I joined workforce, I understood where my priorities were at. Still managed to put in hard core hours in evenings. I too had a health kick and shaped up quite well and only did this while on break from wow for a expansion. Now I have family, and I accept that if I want to play WoW I need to regiment it and it simply cannot dictate my schedule.
I don’t think wow is addictive, however if you have a compulsion or a complitionist mentality, WoW does have a lot to keep pushing you to keep putting in more time.
My advice is, either manage it, decide how much time you can and are willing to give WoW (in a healthy way), and tailor your own expectations as to what you can do in WoW. (eg I love raiding, but I currently cannot commit to two nights, so I settled on LFR, pug raiding and pug pushing M+)
Or if you cannot do it, quit the game.
It’s like ice cream, if you cannot keep your hands off the tub, don’t buy it in the first place.
Hope it helps.