Former smokers who vape face higher lung cancer and death risks, study finds

Increased Health Risks for Former Smokers

The study, which analyzed health records and the national death registry of more than 4.5 million former smokers in South Korea, paints a complex picture of e-cigarette use. Prof. Elizabeth Dudnik, head of thoracic oncology at Assuta Medical Centers, explained that former smokers who continued to use e-cigarettes faced a 56% higher risk of developing lung cancer and a 22% higher risk of death from any cause compared to those who ceased all smoking and vaping. While quitting conventional cigarettes remains beneficial, the study indicates that vaping may erode those gains. The association remained consistent even among those who had quit smoking more than five years earlier, suggesting the results cannot be explained simply by the time elapsed since a person stopped smoking traditional cigarettes.

Biological Concerns and Cancer Development

Although the study does not definitively prove that e-cigarettes cause lung cancer, researchers suggest they may promote cancerous processes that are already underway. Experts emphasize that because lung cancer develops over many years, long-term biological effects require further investigation. The current findings have prompted calls for more research to better understand the long-term consequences of these products and to inform evidence-based public health recommendations.

Broader Context: The Lung-Brain Axis

The impact of smoking and vaping on internal systems extends beyond cancer. Separate research published in Science Advances highlights a “lung-brain axis” that links nicotine exposure to potential neurodegenerative risks. Researchers at the University of Chicago identified that when pulmonary neuroendocrine cells (PNECs) in the lungs are exposed to nicotine, they release exosomes—tiny particles that disrupt iron balance in neurons. While this research is in its early stages and direct human impact remains years away, it underscores the lung’s role as an active signaling organ that can influence brain pathology.

The Need for Comprehensive Screening

As researchers work to understand the risks of nicotine exposure, clinical institutions are advocating for better detection of lung-related conditions. A study published in JAMA Network Open by Northwestern Medicine found that current U.S. Preventive Services Task Force (USPSTF) screening criteria—which focus on adults aged 50-80 with a 20 pack-year smoking history—exclude a large portion of patients who develop lung cancer. Investigators found that two-thirds of patients treated for lung cancer at their institution would not have qualified for screening under these narrow guidelines. They recommend expanding universal age-based screening to include adults aged 40-85, estimating this change could detect 94% of lung cancers and prevent more than 26,000 deaths annually. In response, the Canning Thoracic Institute at Northwestern Medicine has launched a Lung Health Center. This initiative aims to provide low-dose CT scans that assess the lungs, heart, and bones simultaneously, providing a comprehensive baseline for patient health. Clinicians note that such screenings are essential because lung cancer symptoms rarely appear until the disease has reached an advanced stage, with nearly 80% of cases discovered only after they have progressed.

Summary of Findings

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