Drinking coffee had different effects on every person. There are those when they drink coffee they made them alert and awake and energized to do all their works and responsibilities for the day. While there are those like me if they drink coffee they made them sleepy and sometimes experience heart palpitations because of the caffeine contents of coffee. That is why I do not drink coffee anymore. It varies and drinking many cups of coffee is not considered as an addiction and like what had been said in one of the above post it is dependence and you can control it by lessening slowly drinking coffee. You cannot totally withdraw it at once because your body had been immune to it already and let your body adjust to it due time.