Does Switching to E-Cigarettes Eliminate Smoking Harms?
A recent study in the journal Nature Medicine reveals that the reality of switching from traditional cigarettes to e-cigarettes isn’t as straightforward as many might think. The research indicates that those who quit smoking conventional cigarettes but continue with e-cigarettes might not experience the health benefits typically associated with quitting, especially regarding lung cancer and overall mortality risk.
This study, which analyzed data from a large cohort across the nation, suggests that e-cigarette usage post-smoking may diminish some of the protection gained from quitting. Researchers are urging more investigation into the long-term effects of e-cigarettes and recommend creating data-driven guidelines for both the public and healthcare systems.
The research highlights a significant gap in understanding. While e-cigarettes have been promoted as aids for quitting smoking, there haven’t been many thorough studies examining their long-term impact on cancer risk for those who have stopped smoking traditional cigarettes. This leads to ongoing debates about whether switching really helps reduce health risks or instead perpetuates nicotine addiction and potentially contributes to inflammation, oxidative stress, and cancer progression.
Prof. Elizabeth Dudnik, who specializes in thoracic oncology at Assuta Medical Centers, pointed out that e-cigarettes are often marketed as a safer alternative. However, large-scale studies are beginning to challenge that notion. The team of researchers tracked over 4.5 million former smokers in South Korea using health insurance data and national death records.
According to Dudnik, those former smokers who continued with e-cigarettes exhibited a 56% higher risk of lung cancer and a 22% greater chance of death from any cause compared to former smokers who did not use e-cigarettes. In contrast, former smokers that avoided e-cigarettes showed a 44% lower risk of lung cancer and a 37% reduction in overall mortality compared to active smokers. For those who used e-cigarettes after quitting, the reductions were much smaller: just 12% for lung cancer and 23% for death.
To ensure their findings were accurate, the researchers explored various factors, like whether e-cigarette users had quit smoking recently or if they were previously heavy smokers with worse health. Their conclusions remained consistent, even after making several adjustments for potential confounding factors.
The study also indicated that the increased risks were not confined to recent quitters. A notable association between e-cigarette use and a higher risk of lung cancer was observed even in former smokers who had quit for over five years, further reinforcing that time since cessation doesn’t fully explain the observed risks.
Dudnik was careful to clarify that the research does not definitively prove that e-cigarettes cause lung cancer. Instead, it suggests that using them after quitting might diminish some health benefits. Commentary authors in Nature Medicine concurred, pointing out that while direct causation remains to be established, vaping might exacerbate pre-existing cancer processes.
To address the potential long-term biological effects of e-cigarettes, further studies are being called for. A comprehensive review in the journal Carcinogenesis, covering numerous studies from 2017 to 2025, found links between e-cigarette vapor exposure and various biological changes tied to early cancer stages, including DNA damage and chronic inflammation.
Additionally, harmful substances, such as nitrosamines and certain metals, were found in e-cigarette vapor, raising concerns about their safety.
Dudnik recommends that if e-cigarettes are used to help quit smoking, users should aim to eventually stop using them altogether, especially for those at a higher lung cancer risk. She emphasizes that the goal should ultimately be complete cessation of both smoking and nicotine use, ideally achieved with professional guidance.
The authors of the article reiterated the importance of existing World Health Organization guidelines, which advocate for behavioral support and effective medications as the best approach for quitting smoking.
As research continues into the potential impact of e-cigarettes beyond lung cancer, there’s growing interest in their effects on other health aspects. A recent study in the American Journal of Ophthalmology looked into the connection between switching to e-cigarettes and eye disease risk.
Dr. Anry Pitchkhadze, an ophthalmologist with Maccabi Healthcare Services in Israel, noted that researchers analyzed data from 179,273 former smokers. After adjustments for variables like age and underlying health, they compared two groups: those who stopped using nicotine entirely and those who switched to noncombustible nicotine products, including e-cigarettes, over an average follow-up of 4.6 years.
According to Pitchkhadze, those who switched to e-cigarettes had a 24% increased risk of developing diabetic retinopathy, as well as a 7% higher risk for serious eye diseases. However, it’s noted that the observational study does not establish direct causation.
These findings challenge the belief that e-cigarettes are a benign alternative to traditional cigarettes, he remarked. Currently, about 15% of Israelis use e-cigarettes, including approximately 24% of individuals aged 16 to 24. Various studies have linked e-cigarette use to developmental issues in children and adolescents, in addition to risks to cardiovascular health and fertility.
Moshe Bar-Haim, CEO of the Israel Cancer Association, underscored concerns about flavored e-cigarettes attracting younger users, suggesting that Israel should consider banning flavor additives in such products.
