I can totally relate to this article as I learned to drive (fast) from playing Pole Position in the arcades back in the 80's. Nothing like the Suzuki track to teach you to hug the curves.

When I started drinking coffee it got to the point where I started to feel fatigued if I didn't get that first cup. Then in the afternoon I would start to feel that way again unless I had another cup. I consider that to be addiction, having a negative reaction (fatigue) unless I get the substance. However, if I am not at work (where coffee is available) 10 hours straight and just relaxing at home on the weekend, I do not crave the coffee. It's more of an addiction if 1. I am in a situation such as work that requires hours upon hours of my attention and 2. the coffee is easily accessible, such as at work or a coffee shop.

In regards to jitters, it will usually take a really strong cup for that to happen; what really happens to me though is my heart will start racing after having coffee, so it may be another forms of "jitters". I stopped drinking coffee after the heart racing and went to the doctor and my heart checked out fine, but they said to stop drinking coffee if possible, or if not then to limit it to one a day. I've cut it down to half a cup of decaf coffee diluted with water (gross!!!). The fact that I would drink such crap shows how desparately I still want the coffee, but I don't consider it to be life threatening addiction.