IMO, the word "addict" has been overused and that is why they are having such difficulty understanding this. An "addict" is someone who feels compelled to continue using a substance in spite of the harm they are doing to themselves. You aren't considered an "alcoholic", for example, until your drinking has done harm to you or someone else. Apathy has substituted for actual evidence that occasional smoking is a significant contributor to disease, so all nicotine users have been lumped into the "addict" category.
Technically, if you can't show that any harm is being done, you can't really be called an addict.