Is addiction a disease?

This question has been asked before, but it was three years ago and there has been much turnover of jellies in that time. What’s your take? Do you think addiction is a disease or does sobriety come down to willpower (or luck or something else)? If you are willing to share, have you ever dealt with an addiction of your own and how does that color your opinion?

Personally I am several years sober. I feel fortunate that when I realized alcohol was disrupting my life I was able to make the decision to quit and stick with it.