The fascinating thing about this stuff is that you can have outlier people. For instance, tobacco is supposed to be highly addictive. Well, I picked up smoking from a girlfriend in college and we used to smoke all the time. Like ten cigs a day for a year and a half. Real bad, right? Well, one day, I decided "Meh. I'll just stop" and I did. Not because of any reason. I just chose not to. Now cigarettes are way addicti…
For people with no existing anxiety disorders, like you, there is no significant effect so the body doesn't bother seeking it.
Same is true for any other drug addictions. They work by suppressing trauma or sadness or depression... and when the effect wears out, people need it again because the extreme emotions that were being suppressed come back with a bang.