Assessment of Respiratory Health Implications of Vaping: A Systematic Review of Toxicity Mechanisms and Adverse Effects of Electronic Nicotine Delivery Systems.
Study Goal
The researchers aimed to investigate the toxicity mechanisms and adverse effects of e-cigarettes on the respiratory system, comparing them to conventional smoking, and assess their effectiveness for smoking cessation.
Results Summary
The study found that while e-cigarettes have diverse toxicity mechanisms and adverse effects (e.g., inflammation, cough, throat irritation), they are associated with fewer risks than conventional smoking, including lower respiratory and cardiovascular issues and reduced biomarker levels. E-cigarettes were also more effective than nicotine patches for smoking cessation, particularly in pregnant women, though they still posed risks like lower birth weight.
Population
Adults, including pregnant women
Effective Dosage
Not specified
Duration
Not specified (longitudinal studies >16 weeks recommended)
Interactions
None mentioned
| Intervention | Direction | Endpoint | Population | Dosage | Impact | Claim # |
|---|---|---|---|---|---|---|
Electronic nicotine delivery systems (ENDS) | neutral | inflammation, hypoxia, cardiovascular stress, and metabolic changes | - | - | have diverse mechanisms of toxicity | #1 |
Electronic nicotine delivery systems (ENDS) | neutral | cough, throat irritation, nausea, and hemodynamic changes | - | - | Reported adverse effects include | #2 |
Electronic nicotine delivery systems (ENDS) | decrease | conventional cigarette smoking | - | - | are associated with fewer risks compared to | #3 |
Electronic nicotine delivery systems (ENDS) | decrease | respiratory and cardiovascular issues | ENDS users | - | users experience fewer | #4 |
Electronic nicotine delivery systems (ENDS) | decrease | NNAL and CO | ENDS users | - | have lower levels of biomarkers such as | #5 |
Electronic nicotine delivery systems (ENDS) | increase | nicotine replacement therapy (nicotine patches) for smoking cessation | - | - | are more effective than | #6 |
Electronic nicotine delivery systems (ENDS) | increase | smoking cessation | pregnant women | - | are more effective than nicotine replacement therapy (nicotine patches) for smoking cessation | #7 |
Electronic nicotine delivery systems (ENDS) and nicotine-free vaping | no change | conventional smoking | pregnant women | - | side effects are similar to those of | #8 |
Electronic nicotine delivery systems (ENDS) | decrease | birth weight | newborns exposed to ENDS | - | with the exception of a lower birth weight among newborns exposed to | #9 |
Electronic nicotine delivery systems (ENDS) | decrease | conventional smoking | - | - | are considered less detrimental than | #10 |
Electronic nicotine delivery systems (ENDS) | increase | smoking cessation | - | - | are considered a viable option for | #11 |
E-cigarettes are thought to aid in tobacco smoking cessation, but there are concerns about their overall effectiveness and safety for the general population, particularly adults. This review aims to investigate the mechanisms of toxicity and adverse effects of e-cigarettes on the respiratory system, comparing these effects with those of conventional smoking. A systematic review was conducted following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Searches were performed on PubMed, Embase, and the Cochrane Library using keywords, controlled vocabulary, and text words, with the following criteria: studies published in English from 2014 to 2024, open access, peer-reviewed, and full-text availability. Study selection, quality assessment, and data extraction were carried out by two independent reviewers. The Cochrane Risk of Bias 2.0 tool was used to evaluate the risk of bias in included randomized controlled trials, and the Grading of Recommendations Assessment, Development and Evaluation (GRADE) tool was employed to assess the strength of evidence and determine its generalizability. Electronic nicotine delivery systems (ENDS) have diverse mechanisms of toxicity, including inflammation, hypoxia, cardiovascular stress, and metabolic changes. Reported adverse effects include cough, throat irritation, nausea, and hemodynamic changes. However, ENDS are associated with fewer risks compared to conventional cigarette smoking. ENDS users experience fewer respiratory and cardiovascular issues and have lower levels of biomarkers such as NNAL and CO compared to traditional smokers. Additionally, ENDS are more effective than nicotine replacement therapy (nicotine patches) for smoking cessation, particularly in pregnant women. The side effects of ENDS and nicotine-free vaping are similar to those of conventional smoking in pregnant women, with the exception of a lower birth weight among newborns exposed to ENDS (p < 0.05). ENDS present a complex balance of benefits and risks regarding respiratory health. While there are adverse effects, ENDS are considered less detrimental than conventional smoking and a viable option for smoking cessation. Longitudinal studies are needed to evaluate their safety with long-term use (>16 weeks). Policymakers and health practitioners should use these findings to develop balanced public health policies that weigh the benefits of ENDS against potential health risks, enabling informed decision-making for users.