Former smokers who vape now still need to be screened for lung cancer. Many of them aren't E Cigarettes Promote Macrophage Tumor Cells Crosstalk: Focus on Breast Carcinoma Progression and Lung Metastasis E cigarettes cause lung cancer in mice, finds first study tying vaping to cancer Dual Vaping and Smoking Quadruples Lung Cancer Risk Cardiopulmonary Impact of Electronic Cigarettes and Vaping Products: A Scientific Statement From the American Heart Association Circulation E cigarette vapor linked to cancer in mice National Institutes of Health (NIH)