Smoking cigarettes has long been proven to cause severe lung damage, including chronic obstructive pulmonary disease (COPD), emphysema, and lung cancer. Over time, cigarette smoke destroys lung tissue, fills airways with tar, The evidence is clear: Young E cigarette users suffer from respiratory symptoms American Lung Association E cigarettes cause lung condition known as EVALI : Revista Pesquisa Fapesp PET imaging shows greater lung inflammation in e cigarette users than cigarette smokers