Addictive... hmmmm. Assuming you're not refering to serious or clinical addiction, I see it as a consequence of our intensity. Sure, an ENFP might like chocholate, but most likely, they'll LOOOOOOOOOVE CHOCHOLATE and eat it all day long! With that kind of passion, the reward in pleasure is great, so it's entirely possible to get addicted. That's my theory. Oh, and I'm addicted to the music of Dmitri Shostakovich, and diet tonic water.