I have known a lot of addicts in my time and I have come up with the following rule of thumb:  

If you cannot remember the last time you went seven consecutive days without drinking the booze, smoking the cigarette, smoking the pot, etc. then you are an addict.

Conversely, all you have to do to prove you may not be an addict is go seven consecutive days without it.  Thirty days without even better.

But if you cannot go seven days then you are an addict.