I just ran into this picturehttp://billykangas.blogspot.com/2010/05/why-is-coffee-addicting.htmlhttp://billykangas.blogspot.com/2010/05/why-is-coffee-addicting.html
which I thought was funny... but it got me thinking... I don't really know what causes us to become addicted to coffee.
What is the physiology of it all?
Anyone know?