A 2019 University of Dundee study concludes that electronic cigarettes are less harmful to the heart than smoked tobacco.nA month after the transition to vaping and quitting smoking, researchers note an improvement in blood vessels, arteries and blood pressure, a slower resting heart rate.nProfessor Jeremy Pearson, Director of the British Heart Foundation, said: This study suggests that vaping may be less harmful to blood vessels than smoking. In just one month of quitting smoking by switching to an e-cigarette, vascular function begins to recover.