Tim

Thank you for sharing one study. Here are others. When smokers switch to e-cigarettes: Lung cilia recover full function ncbi.nlm.nih.gov/pmc/article… Respiratory tract infections drop dramatically dspace.stir.ac.uk/bitstream/… PATH Study surveyed 5,653 US adults: “Switching completely from past 30-day use of cigarettes to e-cigarettes had short-term beneficial associations with functionally important respiratory symptoms similar to quitting tobacco completely.” sciencedirect.com/science/ar… thelancet.com/journals/eclin… Data from 9,000 adults: “Exclusive e-cigarette use was not associated with higher odds of wheezing compared with never-use, and it was linked to substantially lower odds than exclusive cigarette smoking.” link.springer.com/article/10… Analysis of 19,000 people found 65% of smokers with asthma and 76% of smokers with COPD reported improvement in respiratory symptoms after switching to ecigs. mdpi.com/1660-4601/11/4/4356… COPD smokers’ lung health and quality of life improve dramatically (participants followed for 5 years). “COPD exacerbations were reduced by approximately 50%.” ncbi.nlm.nih.gov/pmc/article… Asthmatic smokers experience “Significant improvement in asthma control and quality of life” pubmed.ncbi.nlm.nih.gov/3196… pubmed.ncbi.nlm.nih.gov/2701… mdpi.com/1660-4601/11/5/4965 discoverymedicine.com/Riccar… mdpi.com/1660-4601/19/15/905… 1,519 adults who have never been established smokers, surveyed across 6 world regions: No evidence of “clinically meaningful difference in respiratory symptom frequency” between current vapers and non-vapers. 2026 link.springer.com/article/10… Systematic review of 23 studies found “Improvements were seen across different [smoking] cessation methods including pharmacotherapy and e-cigarettes. Randomized control trials on e-cigarettes reported significant improvements in flow-mediated dilation irrespective of nicotine content, suggesting that combustion rather than nicotine may be the primary driver of vascular impairment.” 2026 academic.oup.com/eurjpc/arti… What about never-smokers who vape nicotine? 'No detectable changes in lung health' of never-smokers who vaped nicotine for up to 4 years. E-cigarette users who never smoked, followed for 3.5 years: No significant health changes in blood pressure, heart rate, body weight, lung function, respiratory symptoms, exhaled breath nitric oxide or carbon monoxide; and “no pathological findings could be identified on high-resolution computed tomography of the lungs, and no respiratory symptoms were consistently reported in the e-cigarette user group.” nature.com/articles/s41598-0… “Analysis of estimates from exclusive e-cigarette users did not yield a significant risk of myocardial infarction” [heart attack]. And “Overall risk of stroke among e-cigarette users was not significantly higher than the non-users.” link.springer.com/article/10… Systematic review of 10 prospective studies: “EC use by never-smoking individuals is not associated with risk of severe respiratory outcomes, but may be associated with mild coughing/wheezing..” 2025 sciencedirect.com/science/ar… ADD nature.com/articles/s41598-0… Studies that looked at both cardiovascular and lung health: 2022 review by University of Michigan researchers: When smokers switch, risk of acute cardiopulmonary events drops rapidly; long-term use leads to lung health benefits, especially among asthmatic and COPD smokers. No cancer risk found. mdpi.com/1660-4601/19/15/905… E-cigarette users’ health biomarkers are indistinguishable from never-smokers. “When compared with people who never smoked, E-cigarette smokers [sic] had similar blood concentrations of VOCs.” Volatile Organic Compounds (VOCs) are Harmful or Potentially Harmful Substances (HPHS) measured at high levels in smokers. archpublichealth.biomedcentr… In adult COPD smokers: “Diastolic blood pressure and airway resistance improved after e-cigarette use.” (short term study) psycnet.apa.org/doiLanding?d… Cardiovascular and pulmonary events among 46,834 Korean cancer patients: “During a median 4.2 years of follow-up, all-cause mortality was significantly lower in quitters (hazard ratio [HR] = 0.92) and e-cigarette users (HR = 0.84) than continued smokers. Both groups also showed lower cardiovascular event risks (HR = 0.64; and HR = 0.72, respectively). 2026. ajph.aphapublications.org/do…