Vaping substantially less harmful than smoking, largest review of its kind finds King's College London Are e cigarettes safer than cigarettes? UPMC MyHealth Matters E cigarettes are likely to be much less harmful than conventional cigarettes, an analysis of current scientific research suggests. Scientists argue replacing conventional cigarettes with electronic ones could reduce smoking related deaths even though E cigarette users '15% more likely to have a stroke at middle age than smokers' La cigarette lectronique met elle de l'eau dans les poumons Neovapo E cigarettes may be worse for heart than conventional ones, study warns