Is caffeine in coffee harmful and addictive and should I switch from it to tea instead?
It does not matter whether you use tea or coffee. Both are good because both contain anti-oxidants. Antioxidants are phytochemicals, chemicals found in plant foods. In our bodies, antioxidants protect healthy tissues from “oxidants,” also called free radicals. Over time, free radicals can damage cells and cause disease. Antioxidants are like microscopic police officers who seize these bad guys that plan to harm our cells.
The addiction and harm depend on from person to person and also on the type of preparation.
eg. while preparing tea one can either prepare it the standard way (or British way or Chinese way etc) i.e. preparing everything separately. You make the liquor separately, heat milk separately and add it later or do everything together (like in most Indian homes). The first method is the best. The latter has slight issues. If the liquor is heated many times it leads to the formation of tannin. Tannin causes digestion problems. (You can notice it when a transparent layer forms over the liquor). This effect of tannin is neutralized by adding milk.
Sometimes tea causes gas but that depends from person to person. It is also said that tea after a meal destroys the nutritional content of the food. This is a myth and absolute nonsense. In fact, having red tea (tea without milk) acts as a CLEANSING agent. Tea (with milk) can also be considered as a small meal sine it contains milk, sugar, and other ingredients and can also be filling. But that applies only old people. Most of the people do not need to worry about that.
The only problem is that it dispels the need to sleep and hence excessive amounts can lead to sleep deprivation, which is not good in its own way.
But always remember excess of anything is bad.