Why is the use of alcohol, tobacco and other drugs bad for your immune system?

The use of alcohol, tobacco and other drugs has an effect on your eat- and sleep patterns. Eating and sleeping well are important for your immune system. Some drugs influence your appetite. As a result, it is possible you will eat less than your body actually needs or less healthy than you have planned. Besides that, all substances severely reduce the quality of your sleep after use. Read more about the influence of drugs on your sleep here.