I guess the worst thing I have been addicted on is cigarettes (coming out on that one ).
In my mind, I knew it was bad for my health, that it was expensive etc.

I had been on and off for many years. When I was feeling unhappy, stressed, whatever, I would go back to it.

Then I started to think about it, think about why I would fill me up with toxics. In the process, one day, I just said stop. I want to have a choice, I want not to continue hurting myself when hurt comes from the outside, I want to smell good, basically I want to be free.

I guess addiction is a very complex and individual process.
Now I spend too much time on the computer, but it does not impair my day to day life, I even can say it improves it in many ways.

@ xyz: that was a heart melting post