At present, there is no long-term epidemiological data on
E-cigarettes. However, the assessment of the United States and Britain concluded that although the harm of e-cigarettes may be smaller than that of cigarettes, it is not without risk hazards. Potential hazards include nicotine addiction and some cardiovascular risks, although these risks are estimated to be lower than the risk of smoking
Due to cancer, obstructive pulmonary disease and cardiovascular disease, smokers will prematurely kill at least one third of smokers, and smokers' life expectancy will be shortened by 10 years on average
