Objective With the rapid increase in use of electronic nicotine delivery systems (ENDS), such as electronic cigarettes (e-cigarettes), users and non-users are exposed to the aerosol and product constituents. This is a review of published data on the human health effects of exposure to e-cigarettes and their components.

Methods Literature searches were conducted through September 2013 using multiple electronic databases.

Results Forty-four articles are included in this analysis. E-cigarette aerosols may contain propylene glycol, glycerol, flavourings, other chemicals and, usually, nicotine. Aerosolised propylene glycol and glycerol produce mouth and throat irritation and dry cough. No data on the effects of flavouring inhalation were identified. Data on short-term health effects are limited and there are no adequate data on long-term effects. Aerosol exposure may be associated with respiratory function impairment, and serum cotinine levels are similar to those in traditional cigarette smokers. The high nicotine concentrations of some products increase exposure risks for non-users, particularly children. The dangers of secondhand and thirdhand aerosol exposure have not been thoroughly evaluated.

Conclusions Scientific evidence regarding the human health effects of e-cigarettes is limited. While e-cigarette aerosol may contain fewer toxicants than cigarette smoke, studies evaluating whether e-cigarettes are less harmful than cigarettes are inconclusive. Some evidence suggests that e-cigarette use may facilitate smoking cessation, but definitive data are lacking. No e-cigarette has been approved by FDA as a cessation aid. Environmental concerns and issues regarding non-user exposure exist. The health impact of e-cigarettes, for users and the public, cannot be determined with currently available data.

제가 PG하고 VG의 영향에 대해서 알아보려고 논문을 좀 찾아봤는데요

결론은 단기간의 실험으로 PG하고 VG도 영향은 없다

단, glycerin​이 감기걸렸을때 콧물을 말리는 역활에 쓰이는데 이러한 것으로보아 호흡기계통에 수분을 뺏어갈 수 있다

장기적 노출에 대해서는 확인해봐야한다 정도네요

니코틴과 다른 이야기도 있지만 그부분도 단기적으로는 별다른 영향이 없다 입니다.