The word "addiction" doesn't have to refer to a dependency on a chemical substance of whatever type, it can also refer to a compulsion to a behaviour such as gambling, or even computer use. Hmm, yes, there's that too.
I thought I'd share with you my latest addiction. It might do me good. I have become addicted to picking up stones off that shingle beach. There are so many different sorts, you see.
There are red stones.
There are speckled stones.
There are heart shaped stones (if you use your imagination)
There are stones with strange markings.
There are smooth stones which I try to build into Zen formations.
There are hag stones, stones with holes right through. They are also known as witch stones, fairy stones, eye stones and holy stones. They are supposed to be charms that protect against malevolent witchcraft.
There are more, believe me, there are many more: black ones, sparkly ones, knobbly ones. I could go on. I just have to hope it doesn't progress into full-blown beach-combing.