Urges when any negative emotion hits?

I don't think it is as black and white as these articles suggest, but there are hints that feeling bad about anything triggers urges.

Your brain says "Oh... I know what will make you feel good". Whatever the drug is, in our case PMO, our brain has learned how to instantly feel better, even if only for a short while

http://www.huffingtonpost.com/johann-hari/the-real-cause-of-addicti_b_6506936.html

http://www.pickthebrain.com/blog/overcoming-addiction-by-escaping-escapism/

I have noticed that anger, sadness, struggling with something in web-site development, worry about investments ..... they all create strong urges for PMO

And, I can usually stop urges by putting on even forcing a smile and thinking of something funny, or Lovingkindness meditation.

If I can switch my mind to something the feels good, the urge for PMO fades.

So I think it can go both ways. There are definitely guys here that managed to stop using porn, and then felt happy. But there is definitely a case for also being happy with life first, which makes it easier to stop addiction.

I don't think it's one or the other. It's probably both.