I thought true addiction also lead to chemical changes in the body and mind, leading to withdrawal systems when the the person stopped taking the substance.
In Vampirequeen's case, I think caffeine is addictive and does cause withdrawal systems. When I unaccountably went completely off caffeine in any form for about 4 days, I developed a splitting headache that went as soon as I had my first cup of coffee. When the same thing happened when I repeated the sequence. I immediately started drinking de-caff coffee.
With cheese, flapjacks etc, where you can manage without them without any discomfort, albeit life is so much better when they are a dominant part of your diet, no, its not addiction, just comfort eating - and I am all for comfort.