Vaping and smoking together increases lung cancer risk fourfold E cigarettes: 'cancer risk close to zero' Bhekisisa Most E cigarette Users Ages 18 to 29 Never Smoked Before American Cancer Society Australian researchers have issued one of the strongest warnings yet about vaping, saying a major review of evidence suggests e cigarettes are likely to cause lung and oral cancer. The review found signs New study comes the closest yet to proving that e cigarettes aren't as dangerous as smoking E Cigarette Research for Lung Cancer Patients Roy Castle