{"id":25125,"date":"2025-06-26T10:11:21","date_gmt":"2025-06-26T10:11:21","guid":{"rendered":"https:\/\/clearingtheair.eu\/?p=25125"},"modified":"2025-06-26T10:23:49","modified_gmt":"2025-06-26T10:23:49","slug":"misleading-vape-research-threatens-public-health-policy-expert-review-warns","status":"publish","type":"post","link":"https:\/\/clearingtheair.eu\/en\/post\/misleading-vape-research-threatens-public-health-policy-expert-review-warns\/","title":{"rendered":"Misleading vape research threatens public health policy, expert review warns"},"content":{"rendered":"<div class=\"clear-before-content-2\" style=\"margin-top: 20px;margin-bottom: 20px;margin-left: auto;margin-right: auto;text-align: center;\" id=\"clear-1870864378\"><img src=\"https:\/\/clearingtheair.eu\/wp-content\/uploads\/2026\/04\/caafc5c68900198b80aee12c11b50184.avif\" alt=\"\"   style=\"display: inline-block;\" \/><\/div>\n<ul class=\"wp-block-list\">\n<li><strong>A widely cited 2024 meta-analysis by Glantz et al misclassified diseases, double-counted cases, and relied on weaker study designs, experts say.<\/strong><\/li>\n\n\n\n<li><strong>Risk estimates based on inconsistent data may overstate the harms of vaping.<\/strong><\/li>\n\n\n\n<li><strong>High-quality studies find no evidence of serious respiratory harm in never-smokers who vape.<\/strong><\/li>\n\n\n\n<li><strong>Flawed evidence can mislead policymakers and discourage smokers from switching to safer alternatives.<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Poor-quality research on vaping is distorting public health policy and discouraging smokers from switching to safer alternatives, a new editorial has warned.<\/p>\n\n\n\n<p>Published in Internal and Emergency Medicine, <a href=\"https:\/\/link.springer.com\/article\/10.1007\/s11739-025-04019-w\" rel=\"nofollow noopener\" target=\"_blank\">the expert article<\/a> critiques a 2024 meta-analysis by Glantz and colleagues, claiming it suffers from <strong>\u201cmajor methodological flaws\u201d<\/strong> that make its conclusions unreliable.<\/p>\n\n\n\n<p>The Glantz study, published in NEJM Evidence, suggested that vaping could pose disease risks similar to smoking, especially for cardiovascular conditions. But the new review, by Rodu and colleagues, argues that those claims are based on shaky evidence.<\/p>\n\n\n\n<p>\u201cThe credibility of any meta-analysis is directly dependent on the quality, comparability, and methodological rigour of the studies it includes,\u201d they write.<\/p>\n\n\n\n<p>The editorial says Glantz\u2019s team grouped very different illnesses under broad disease labels. For example, erectile dysfunction and heart attacks were both classified as \u201ccardiovascular disease.\u201d Similarly, respiratory conditions like flu and chronic obstructive pulmonary disease (COPD) were lumped together \u201cdespite having distinct clinical profiles.\u201d<\/p>\n\n\n\n<p>Rodu and colleagues are also concerned that the Glantz paper relied too much on cross-sectional studies, with 76 per cent of its odds ratios coming from this type of research. But these studies measure exposure and health outcomes at the same time, so they can\u2019t prove cause and effect.&nbsp;<\/p>\n\n\n\n<p>\u201cCross-sectional designs assess both exposure and outcome at a single point in time&#8230; the evidence cannot support causal inferences,\u201d the authors explain.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Many of the studies used in the Glantz meta-analysis also didn\u2019t include basic timing data such as when participants started smoking or developed illness. This makes it \u201cimpossible to establish whether the exposure could plausibly have contributed to the health outcome,\u201d according to the review.<\/p>\n<\/blockquote>\n\n\n\n<p>The authors warn that repeating these types of errors on a large scale is undermining trust in public health science. They say: \u201cThe persistent repetition of such methodological shortcomings has now reached a scale that risks undermining the credibility of public health science itself.\u201d<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Double counting<\/strong><\/h3>\n\n\n\n<p>Another issue is double-counting. Some included studies drew on the same national surveys (like NHIS or BRFSS), meaning some participants may have been counted more than once.&nbsp;<\/p>\n\n\n\n<p>This could \u201cartificially enhance the perceived consistency or precision of the findings.\u201d Even statistical adjustments, such as inflating error margins, don\u2019t fix the underlying problem, the review says.<\/p>\n\n\n\n<p>The absence of cumulative exposure data is another key gap. Without knowing how much or how long someone has vaped, researchers can\u2019t accurately assess risk. \u201cThis can obscure true dose-response relationships and conflate light, short-term use with heavy, chronic use,\u201d the editorial notes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Flaws in longer term studies<\/strong><\/h3>\n\n\n\n<p>Even longer-term studies, which are often considered more reliable, had flaws. Many didn\u2019t track changes in smoking or vaping habits over time. According to the review, this \u201cundermines the validity of the conclusions drawn from such data.\u201d<\/p>\n\n\n\n<p>One exception praised by Rodu\u2019s team is the Berlowitz study, which accounted for these behavioural changes and found \u201cno statistically significant association between e-cigarette use and cardiovascular outcomes.\u201d This finding \u201cdirectly challenges the overarching conclusions of Glantz et al.\u2019s meta-analysis,\u201d the authors say.&nbsp;<\/p>\n\n\n\n<p>Another example is the Xie study, which linked vaping to COPD. Upon closer inspection, Rodu et al. found that \u201cnearly all of the individuals diagnosed with COPD&#8230; were either current or former smokers. In fact, only one participant with COPD had never smoked.\u201d<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Strong studies show no respiratory issues from vaping<\/strong><\/h3>\n\n\n\n<p>This aligns with recent reviews of high-quality studies. One umbrella review looked at 12 systematic reviews and found \u201cno convincing evidence of short- or medium-term respiratory harm associated with e-cigarette use.\u201d Among never-smokers, \u201cboth reviews found no evidence of serious or sustained respiratory harm attributable to vaping.\u201d<\/p>\n\n\n\n<p>The Glantz analysis also failed to separate dual users (people who smoke and vape) from exclusive vapers or smokers. \u201cMost analyses do not disaggregate these patterns, undermining meaningful interpretation of dual-use risk,\u201d Rodu and colleagues note.<\/p>\n\n\n\n<p>They also point to statistical mistakes, including incorrect use of the Bonferroni correction &#8211; a method for controlling false positives. The paper says it was applied \u201cwithout an adequate explanation of which comparisons it was meant to control for or why such a stringent adjustment was appropriate.\u201d This not only reduced the study\u2019s power but also wrongly assumed that all comparisons were independent.<\/p>\n\n\n\n<p>Another serious error was treating a non-significant result as proof that different study types are equivalent. \u201cMistaking a lack of statistical significance for evidence of equivalence is a common but serious error,\u201d they warn.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u2018Distorting public understanding\u2019<\/strong><\/h3>\n\n\n\n<p>These mistakes aren\u2019t just academic. \u201cThe misuse of statistical tools in this context does not reflect a harmless misunderstanding,\u201d the editorial says. \u201cRather, it represents a concern in scientific reasoning that can mislead readers, distort public understanding of risk, and skew the policy debate around e-cigarettes.\u201d<\/p>\n\n\n\n<p>This matters because such distorted findings can make people wrongly believe that vaping is as dangerous as smoking. That could stop smokers from switching to a less harmful option. The authors note: \u201cSubjective evidence indicates that e-cigarette users consistently rate their health more favorably than smokers,\u201d echoing guidance from UK bodies like the Royal College of Physicians and Public Health England.<\/p>\n\n\n\n<p>\u201cThe consequences of flawed meta-analyses are not confined to academic debate,\u201d the editorial warns. \u201cOnce established, these citations can take on a life of their own, being treated as definitive summaries of the evidence even when their underlying data and interpretations are deeply problematic.\u201d<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A call for better standards<\/strong><\/h3>\n\n\n\n<p>The authors call for better standards in how meta-analyses are done and interpreted, especially in sensitive areas like tobacco harm reduction. \u201cThe strength of scientific conclusions depends not on the volume of data but on the integrity of the methods used to analyze and interpret it,\u201d they say.<\/p>\n\n\n\n<p>They conclude that meta-analyses must be done with care, saying: \u201cAggregating flawed or incomparable studies does not create strength through numbers. Instead, it creates the illusion of authority while concealing the structural weaknesses of the underlying evidence.\u201d<\/p>\n<div class=\"clear-after-content-2\" style=\"margin-top: 20px;margin-bottom: 20px;margin-left: auto;margin-right: auto;text-align: center;\" id=\"clear-1160363562\"><img src=\"https:\/\/clearingtheair.eu\/wp-content\/uploads\/2026\/04\/caafc5c68900198b80aee12c11b50184.avif\" alt=\"\"   style=\"display: inline-block;\" \/><\/div>","protected":false},"excerpt":{"rendered":"<p>Poor-quality research on vaping is distorting public health policy and discouraging smokers from switching to safer alternatives, a new editorial has warned. Published in Internal and Emergency Medicine, the expert article critiques a 2024 meta-analysis by Glantz and colleagues, claiming it suffers&hellip;<\/p>\n","protected":false},"author":990002,"featured_media":25146,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[259,257],"tags":[27],"slider":[],"class_list":["post-25125","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science","category-news","tag-article"],"_links":{"self":[{"href":"https:\/\/clearingtheair.eu\/en\/wp-json\/wp\/v2\/posts\/25125","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/clearingtheair.eu\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/clearingtheair.eu\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/clearingtheair.eu\/en\/wp-json\/wp\/v2\/users\/990002"}],"replies":[{"embeddable":true,"href":"https:\/\/clearingtheair.eu\/en\/wp-json\/wp\/v2\/comments?post=25125"}],"version-history":[{"count":3,"href":"https:\/\/clearingtheair.eu\/en\/wp-json\/wp\/v2\/posts\/25125\/revisions"}],"predecessor-version":[{"id":25141,"href":"https:\/\/clearingtheair.eu\/en\/wp-json\/wp\/v2\/posts\/25125\/revisions\/25141"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/clearingtheair.eu\/en\/wp-json\/wp\/v2\/media\/25146"}],"wp:attachment":[{"href":"https:\/\/clearingtheair.eu\/en\/wp-json\/wp\/v2\/media?parent=25125"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/clearingtheair.eu\/en\/wp-json\/wp\/v2\/categories?post=25125"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/clearingtheair.eu\/en\/wp-json\/wp\/v2\/tags?post=25125"},{"taxonomy":"slider","embeddable":true,"href":"https:\/\/clearingtheair.eu\/en\/wp-json\/wp\/v2\/slider?post=25125"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}