Nobody can give you a single number, because modern e-cigarettes have only been widely used since around 2010 and the large-scale, decades-long mortality data simply does not exist yet. What does exist is a patchwork of modeling studies, biomarker comparisons, and organ-specific research that collectively paints a rough picture. One recent simulation estimated that adolescents who vape exclusively face a premature mortality probability between about 0.15% and 0.84%, compared with roughly 7–8% for those who smoke cigarettes. That gap is enormous, but the vaping number is not zero, and new evidence about cardiovascular, respiratory, and cellular damage keeps accumulating in ways that make the long-term outlook harder to pin down than the early optimism suggested.
What the Lifespan Models Actually Project
Because real-world death certificates listing “vaping” as a cause are still extremely rare, researchers have turned to computer simulations that plug in assumptions about relative harm. A study modeling U.S. adolescents who initiated vaping versus smoking found that exclusive vapers had a premature mortality probability roughly ten to fifty times lower than smokers, depending on which set of harm assumptions was used.1American Journal of Preventive Medicine. The Lifetime Mortality Implications of Vaping and Smoking Initiated During Adolescence A separate population-level model projected that if current U.S. vaping patterns continue and people keep substituting e-cigarettes for combustible ones, around 1.8 million premature deaths could be avoided and nearly 39 million life-years gained between 2013 and 2060.2PubMed Central. Public health implications of vaping in the USA: the smoking and vaping simulation model
But models can also tell a darker story depending on the inputs. A competing simulation that accounted for youth uptake among people who otherwise would never have smoked estimated that e-cigarette use in 2014 alone could result in roughly 1.5 million life-years lost across the population, even assuming an optimistic 95% harm reduction compared with cigarettes. When the assumed harm reduction dropped to 50%, the projected losses rose further.3PLOS ONE. Quantifying population-level health benefits and harms of e-cigarette use in the United States The takeaway is that models are only as reliable as their assumptions, and the two biggest unknowns remain how harmful vaping truly is over a full lifetime and how many people vape who would never have smoked.
Why a Definitive Answer Is Still Years Away
Most of the large observational studies on vaping and disease are cross-sectional, meaning they capture a snapshot at one point in time rather than tracking people over decades. That design cannot tell you whether vaping caused a condition or whether people who already had respiratory or cardiovascular problems gravitated toward e-cigarettes as a perceived alternative to smoking. A reanalysis of several prominent studies found that only three of the papers examined accounted for this reverse-causation problem, and each of those three found that smoking, not vaping, drove the disease associations.4PubMed Central. Comparing smoking-related disease rates from e-cigarette use with those from tobacco cigarette use: a reanalysis of a recently-published study
There is also a persistent confounding issue with former smokers. A large share of current vapers used to smoke, so when researchers see higher rates of disease among vapers, teasing apart which habit caused the damage is genuinely difficult. One analysis of common flaws in highly cited e-cigarette research noted that studying non-acute effects in a population of former smokers inherently risks attributing morbidity to vaping when it may actually stem from years of prior smoking.5PubMed Central. Analysis of common methodological flaws in the highest cited e-cigarette epidemiology research None of this means vaping is safe. It means that the honest scientific answer to “how long do vapers live” is still being built, and anyone quoting a firm number is outrunning the data.
Cardiovascular Harm and Vaping
Heart and blood vessel damage is one of the better-studied consequences of e-cigarette use, and the findings are not reassuring. A systematic review concluded that vaping is linked to increased oxidative stress, endothelial dysfunction (damage to the inner lining of blood vessels), inflammation, and stiffened arteries, all of which contribute to the buildup of plaques that cause heart attacks and strokes.6PubMed Central. How Electronic Cigarette Affects the Vascular System A separate review focused specifically on atherosclerosis reached the same conclusion, identifying harmful aerosol constituents that promote plaque formation through overlapping pathways.7PubMed Central. E-cigarettes and arterial health: A review of the link between vaping and atherosclerosis progression
Nicotine itself plays a specific role here. A study comparing habitual e-cigarette users to non-users found that vapers showed a shift toward sympathetic nervous system dominance, essentially the “fight or flight” branch staying turned up. That pattern is associated with elevated heart rate and blood pressure over time.8PubMed Central. Increased Cardiac Sympathetic Activity and Oxidative Stress in Habitual Electronic Cigarette Users Research on pod-based devices with high-concentration nicotine salts found that those formulations were more likely to trigger cardiac arrhythmias by stimulating the same receptor that beta-blocker medications are designed to inhibit.9Nicotine and Tobacco Research. Study finds pod-based e-cigarettes with higher nicotine more likely to cause irregular heartbeat The cardiovascular picture, in other words, is not one where vaping clearly shortens life the way smoking does, but it is one where the mechanisms for long-term damage are clearly present.
What Vaping Does to the Lungs
Chronic obstructive pulmonary disease, or COPD, is one of the leading causes of death worldwide, and its association with vaping is growing more defined. A meta-analysis pooling data from multiple studies found that current e-cigarette users had about 48% higher odds of COPD compared to non-users, with former users showing even higher odds at roughly 84% above non-users.10PubMed Central. Association of electronic cigarette use and risk of COPD: a systematic review and meta-analysis Among people who had never smoked a conventional cigarette, e-cigarette use was still associated with increased odds of asthma and COPD, though the researchers cautioned that the cross-sectional study design could not prove vaping caused these conditions.11PubMed Central. Electronic cigarette use and its association with asthma, chronic obstructive pulmonary disease (COPD) and asthma-COPD overlap syndrome among never cigarette smokers
At the cellular level, the mechanisms are becoming clearer. Vaping triggers immune cells in the lungs to shift into an inflamed state, pumping out inflammatory signals while simultaneously becoming worse at their primary job of clearing debris and pathogens.12PubMed. Understanding potential mechanisms of harm: the drivers of electronic cigarette-induced changes in alveolar macrophages, neutrophils, and lung epithelial cells Even nicotine-free aerosols damage the lungs. A laboratory study found that after 24 sessions of exposure to nicotine-free vape aerosol, the tiny hair-like cilia that sweep mucus out of the airways lost nearly a fifth of their beating speed. After 60 sessions, that loss exceeded 50%, and the barrier lining the airways was compromised by more than three quarters. Cilia function recovered within about two days after exposure stopped, and the airway barrier took about three days, suggesting the damage is not immediately permanent but accumulates with repeated use.13PubMed Central. Repetitive Exposure to Nicotine-Free Vaping Impairs Airway Defences and Delays Recovery
DNA Damage and the Cancer Question
The cancer risk from vaping is perhaps the biggest open question for long-term survival. Cancer takes decades to develop, and e-cigarettes have not been around long enough for meaningful epidemiological cancer data to emerge. But the laboratory and animal evidence is concerning. A mouse study found that e-cigarette smoke produced mutagenic DNA changes in lung, bladder, and heart tissue, while also reducing the body’s ability to repair that DNA damage. The researchers concluded that the nicotine and its metabolites can induce these effects and enhance the transformation of normal cells into cancerous ones.14PubMed Central. E-cigarette smoke damages DNA and reduces repair activity in mouse lung, heart, and bladder as well as in human lung and bladder cells Separately, a review of epithelial cell research found that e-cigarette aerosol can form DNA adducts, which are chemical modifications to DNA that drive oxidative stress and inflammation.15PubMed Central. Mechanisms of E-Cigarette Vape-Induced Epithelial Cell Damage
The critical nuance is dose. Cigarette smoke delivers far higher concentrations of the carcinogens most directly implicated in lung and bladder cancer. Whether the lower but non-zero exposure from vaping is enough to meaningfully raise cancer rates over a lifetime remains unknown. Researchers will likely need another 10 to 20 years of follow-up data before they can answer that question with any confidence.
Toxicant Levels Compared to Cigarettes
If you are comparing vaping to smoking, the biomarker evidence is fairly consistent and forms the scientific basis for the “harm reduction” argument. A study comparing exclusive e-cigarette users to cigarette smokers found that vapers had roughly 93% lower levels of total nicotine metabolites and about 98% lower levels of NNAL, a key tobacco-specific carcinogen marker. Every measured volatile organic compound was also significantly lower in vapers.16PubMed Central. Comparison of Nicotine and Toxicant Exposure in Users of Electronic Cigarettes and Combustible Cigarettes A separate analysis using national health survey data confirmed these findings: NNAL levels in smokers were nearly 86 times higher than in exclusive e-cigarette users. For eight of thirteen volatile organic compounds measured, vapers’ levels did not differ significantly from people who used no nicotine products at all.17Scientific Reports. Comparison of biomarkers of exposure among US adult smokers, users of electronic nicotine delivery systems, dual users and nonusers, 2018–2019
A Cochrane-linked review of biomarkers in people who switched from smoking to vaping found that 12 of 13 biomarkers of potential harm were significantly lower in e-cigarette users than in continuing smokers, with no difference for the thirteenth.18PubMed Central. Biomarkers of potential harm in people switching from smoking tobacco to exclusive e-cigarette use, dual use or abstinence: secondary analysis of Cochrane systematic review of trials of e-cigarettes for smoking cessation For a smoker weighing their options, this is meaningful. But “much less toxic than cigarettes” is not the same as “safe,” especially for someone who would otherwise use no nicotine at all.
The Dual-Use Trap
A substantial number of vapers continue to smoke conventional cigarettes as well. This dual use turns out to be worse than smoking alone for several outcomes. A pooled analysis found that people who both smoked and vaped had 20–41% higher odds of disease compared with people who only smoked, across multiple health conditions.19PubMed Central. Population-Based Disease Odds for E-Cigarettes and Dual Use versus Cigarettes The biomarker data supports this: dual users who smoked ten or more cigarettes per day showed volatile organic compound levels no different from exclusive smokers, wiping out whatever toxicant reduction e-cigarettes might otherwise provide.17Scientific Reports. Comparison of biomarkers of exposure among US adult smokers, users of electronic nicotine delivery systems, dual users and nonusers, 2018–2019 If you vape and smoke, the health math is worse than either habit alone.
Organ Damage Beyond the Heart and Lungs
Research is beginning to reveal that vaping’s effects reach further than the organs that directly contact aerosol. An animal study examining kidney and liver tissue after chronic e-cigarette vapor inhalation found patterns of gene expression consistent with promoting fibrosis, the scarring process that slowly degrades organ function. The kidneys showed signs of oxidative stress and inflammation, while the liver showed disrupted fat metabolism and immune signaling.20PubMed Central. E-cigarette vaping is associated with pro-fibrotic gene expression in kidney and liver tissues These are early-stage findings from animal models, not death-rate data, but they suggest the long-term consequences of vaping may not be limited to heart attacks and lung disease.
Flavoring chemicals add another layer of concern. A systematic review found that flavored e-cigarettes, regardless of whether they contain nicotine, can cause harm during chronic use. The specific chemicals that make vape liquid taste like mango or mint interact with lung tissue in ways that pure nicotine alone does not.21PubMed Central. Findings on e-cigarette flavors and their implications for human health: a systematic review And the hardware itself is a source of exposure: the metal heating elements in vape cartridges leach nickel, chromium, lead, and other heavy metals into the aerosol, sometimes at levels exceeding pharmaceutical guidelines for inhaled products.22PubMed Central. Heavy Metals in Cannabis Vapes and Their Health Implications-A Scoping Review The doses are small compared to occupational metal exposure, but inhaling even trace quantities of lead and chromium directly into lung tissue day after day for years is a genuine concern for which there is no reassuring long-term data.
Adolescent Vaping and the Developing Brain
The lifespan question takes on a different shape for teenagers, who make up a large proportion of new vapers. Nicotine exposure during adolescence does not just create addiction; it physically reshapes brain circuits that are still under construction. Animal research has shown that nicotine during mid-adolescence permanently alters dopamine signaling in the prefrontal cortex, the region responsible for attention, impulse control, and decision-making. These changes persisted into adulthood and were associated with lasting cognitive deficits, including reduced attention and increased impulsivity, with some effects showing up differently in males and females.23Molecular Psychiatry. Adolescent nicotine exposure and persistent neurocircuitry changes: unveiling lifelong psychiatric risks
How does this affect lifespan? Not through a single disease mechanism, but through downstream consequences. Increased impulsivity and disrupted attention in adulthood raise the likelihood of substance use disorders, accidents, and poorer management of chronic health conditions. The mortality modeling discussed earlier estimated that adolescent-onset vapers still face some premature death risk, even if far lower than adolescent smokers.1American Journal of Preventive Medicine. The Lifetime Mortality Implications of Vaping and Smoking Initiated During Adolescence For a teenager who would otherwise never use nicotine, any added risk is risk that did not need to exist.
Secondhand Aerosol and Bystander Exposure
One frequently overlooked dimension is what vaping does to the people around you. E-cigarette aerosol is not just “water vapor,” a misconception that persists despite clear evidence otherwise. A controlled exposure study found that particulate matter concentrations in a room during vaping sessions were significantly higher than in a control setting with no vaping.24PubMed. Passive exposure of non-smokers to E-Cigarette aerosols: Sensory irritation, timing and association with volatile organic compounds The concentrations are generally lower than those produced by cigarette smoke, but they contain ultrafine particles, nicotine, and volatile organic compounds that bystanders inhale. For household members who share indoor space with a regular vaper, especially children or people with existing respiratory conditions, the cumulative exposure over years is an unknown that current lifespan models do not account for at all.