Can disposable paper cups be harmful to health if used too much?

There will be a layer of wax on the inner wall of disposable paper cups to avoid water leakage. At present, the wax used by many black-hearted manufacturers contains toxic substances. If you want to buy it, it is recommended to choose a formal channel. Also, it is best not to let go of water, otherwise it will also produce toxic substances. If you can, buy yourself a cup. This is the safest.