You are mistaken. A substance itself is not what causes an addiction. Be it cigarettes, alcohol, heroin or cheese puffs; none of these things by themselves are inherently addicting. Yes, some substances possess more addictive qualities than others, say, for example, methamphetamine compared to a pack of Marlboros, but that is not how it works. I can smoke a cigarette today and then never think of it tomorrow, whereas someone else may never be able to stop once they start. This is not a matter of the cigarette, but a matter of the individual that must engage in such addictive behavior for reasons that vary. The same principle applies with food. Our brains work in different ways, and addictions can take on a myriad of forms (think money, power, fame, shopping, sex, etc.) To believe that addictions are restricted to things like drugs and alcohol is a pretty grand ignorance of the society we are currently living in.