While it is true that gut feelings+euphoria ≠ addiction, that doesn't preclude addiction from using the same brain circuitry. In fact some social psychologists, esp Helen Fisher, speculate that addiction neuron circuits were developed first to support the first stages of romantic love and then co-opted by addictive substances and behaviors.

This framework has been useful in my recent break up because it is intuitively true that addictive cravings are not necessarily a good impulse to follow and satisfying the cravings does not necessarily reduce them in the long term. When I'm ruminating it is handy to be able to mark it as "ignore: meaningless craving."

http://jn.physiology.org/content/104/1/51.short

http://jn.physiology.org/content/94/1/327.short

https://books.google.com/books?hl=en&lr=&id=bUSRsXs2kGEC&oi=fnd&pg=PA87&dq=Helen+Fisher+addiction+love&ots=2HRkw3aRuM&sig=3Fvz0NYzaaxtk0l6meaz7jyN934#v=onepage&q=addiction&f=false