Search

Objectives. To assess how and in what extent the electronic nicotine delivery systems (ENDS) use substituted the consumption of traditional combustible cigarettes (c-cigarettes, c-cig). Materials and Methods. We performed a systematic review of the literature up to August 2019 in scientific databases. Primary outcomes were proportion of complete or partial substitution of conventional to electronic cigarettes and related economic aspects. Secondary outcomes were odds ratio of substitution and country-wise time trends. Results. We retrieved 3,628 references and included 49 studies, providing economic and epidemiological data. Economic studies of cross-price elasticity showed that combustible cigarettes are partially substitutable for electronic cigarettes. Most studies reported that electronic cigarettes consumption prevalence increased over time. Three studies reported a significant reduction of combustible cigarettes consumed per day among dual users (combustible-plus electronic-cigarettes users) versus combustible-cigarettes users. The pooled adjusted odds ratio of quitting combustible cigarettes among electronic cigarettes users versus never or past electronic cigarettes (e-cigarettes, e-cig) users was 1.19 (95% confidence interval 1.09 to 1.30; heterogeneity score 0%). Longitudinal studies showed globally a growing prevalence of electronic cigarettes use, mainly in adolescents. A negative relationship between consumption and price increase of electronic and combustible cigarettes was found. Conclusion. The chance of quitting smoking combustible cigarettes among current electronic nicotine delivery systems users was increased with respect to never- or pastelectronic nicotine delivery systems users. Economic studies reported that electronic cigarette is partially substitutable for combustible cigarettes. [ABSTRACT FROM AUTHOR]

Since 2004, the electronic cigarette (EC) is available, a device that heats nicotine and administers it as part of a vapor. We present a narrative review of the EC and its effect on health. Its use is to stop smoking, in which the evidence is low, and ends up being used at the same time as the cigarette they could not quit. In addition, those who never smoked, mainly teenagers and young people, begin consumption. Its use raises the levels of nicotine, particles, volatile organic compounds, polycyclic aromatic hydrocarbons, carbonyls and metals such as aluminum. In vitro, the EC causes inflammation, oxidative stress and is toxic to multiple cell types, including lung, endothelial and stem cells. Produces increased susceptibility to viral and bacterial infections. Compared to cigarettes, the EC produces a larger and more intense number of deleted genes. At bronchoscopy the airways are friable and erythematous, and the bronchial epithelium with a differentiated protein expression. It has been associated with cough, bronchitis symptoms and the respiratory failure by pneumonitis epidemic that has led several dozen people to death. Because of its harmful effects, the EC should only be used by medical prescription, as a measure to help quit tobacco, and its use in indoor and public environments be prohibited. As the EC components responsible for the associated deaths have not been determined, their use should be banned until these factors are known. [ABSTRACT FROM AUTHOR]