When I was ten, I couldn't wait to become of legal age so I could smoke cigarettes.
I became a full-on smoker by the age of thirteen and have never quit longer than five day since.
I got into pot very early on, and I found a cheap and easy way to get 'high', which was by not going to sleep. I realized now that I always liked to be in an altered state. Being normal is just too boring and painful. I guess this makes me an addict!
I never thought so before, but now the definition makes much more sense. Kudos!