Praise be to Allaah.
Undoubtedly anything that is harmful is haraam. Hence Allaah forbade alcohol because it affects the mind, and smoking is forbidden because it causes widespread harm and diseases. It is also known that there are permissible drinks which do not cause harm, such as coffee and tea, which usually do not cause harm and are usually drunk for relaxation, so there is nothing wrong with drinking them. And there are other good drinks such as milk and fruit juices. If some of those things which are nowadays known as refreshments cause harm, then they should be considered an extravagance.