Smoking has long been known as a major cause of lung cancer, but now, even vapes and e cigarettes are contributing to the risk. This World Lung Day, let's raise awareness and make E cigarette smoke caused lung cancer in mice ecancer E cigarette vapor linked to cancer in mice National Institutes of Health (NIH) E cigarettes cause lung cancer in mice, finds first study tying vaping to cancer Dual Vaping and Smoking Quadruples Lung Cancer Risk E Cigarette or Vaping Associated Lung Injury New England Journal of Medicine