I used to be extremely addicted to caffeine. At one time, I was drinking up to 7 to 8 energy drinks a week. It was ridiculous. Fortunately, I never developed any serious problems from it.
Then, I found out I had ADD, legit. I went to a psychiatrist and everything and he prescribed me with Adderall. After than, I don't know how I did it, but I didn't ingest barely any caffeine for a whole month. Those small amounts I did at the beginning of my ADD treatment made me fell all weird and stuff, so I stopped all together for about a month. That was last summer.
Now, I don't drink nearly as much of caffeine as I used to. Granted, I still take Adderall, but my body is pretty comfortable with it. Still, I am careful to the max. I have heard stories of people mixing Adderall and caffeine together and it never turned out good
I know that this is an extremely old post, but I am also finding that I am consuming an excessive amount of caffeinated drinks. I am trying to limit my coffee and caffeinated tea intake to one cup daily.