I stopped drinking coffee two months ago and I can confirm it gives physical and mental addiction. In the rest of the article are described five clusters of common withdrawal symptoms and how to give up with caffeine without suffering.

Researchers could find it interesting to delve into the accquired addiction to coffee of traditionally tea-drinking chinese migrants in Italy... I know a few who have at least 6 or 7 expressos or cappuccinos a day and some before they go to bed.... Altro chè ginseng !!!
The West swops habits with the East?
Shouldn't migrant mutants and hybrids be included in all this research, if this is going to be an effort to bring about better awareness of our health condition???

I think this article can be a good starting point to reflect on caffeine danger. It's not an anthropological research and not a comparison of variety of races and their imported habits as migrants. Everybody can read the article, also a Chinese in Italy, then make his own conclusions.