Reducing Cancer Risks: How Quitting Cigarettes and Vaping Can Mitigate Smoking’s Impact

A groundbreaking study involving over 4.5 million participants reveals alarming statistics: smokers who switched to vaping post-cessation face more than a 50% increased risk of developing lung cancer compared to those who quit smoking entirely. Nonetheless, the research also emphasizes that using e-cigarettes to aid in quitting is a safer alternative than continued cigarette smoking.

As noted by Becky Freeman from the University of Sydney, Australia, who was not part of the study, “This research contributes to a growing body of evidence indicating that e-cigarettes may not be as low-risk as initially suggested. It’s essential for those attempting to quit smoking to explore safer options, yet effective cessation methods should be prioritized first.”

In the UK, over 40% of smokers are expected to use e-cigarettes in 2024, with 20% of ex-smokers continuing to vape over a year after quitting. Although e-cigarettes are often praised as a cessation tool, research links them to airway inflammation, diminished lung function, and increased cancer risk in animal studies.

To delve deeper into the effects of e-cigarettes, Kim Young Wook and a team from Seoul National University analyzed data from South Korea’s National Health Checkup Program from 2018 to 2023, tracking participants classified as current smokers, short-term quitters, or long-term quitters. Throughout the five-year span, 35,887 individuals developed lung cancer, leading to 12,807 related deaths.

Upon analyzing e-cigarette usage among different participant groups, researchers discovered that ex-smokers who continued to vape exhibited a significantly higher risk of dying from lung cancer compared to non-vapers. “Those who used e-cigarettes after quitting had a 56% elevated risk when compared to individuals who quit smoking completely,” Kim noted.

While the need for extended research is clear, certain studies suggest that e-cigarette chemicals may cause DNA damage, and vaping has been associated with oxidative stress, epigenetic changes, and inflammation in respiratory and oral tissues.

However, Kim’s team emphasizes that causation cannot be definitively established, stressing the necessity for further investigations, particularly involving diverse populations outside South Korea.

Remarkably, it was found that ex-smokers who utilized e-cigarettes had a significantly lower overall mortality risk compared to current smokers, reinforcing the substantial health benefits of quitting smoking altogether.

According to Nicole Lee from Curtin University in Perth, Australia, the study underscores that quitting both smoking and vaping entirely is more effective in preventing lung cancer than merely transitioning to e-cigarettes during the quitting phase. “The implications of this study are crucial for those who have stopped smoking,” she stated.

“Our ongoing recommendation to smokers is that complete cessation is the safest option. However, if quitting is unachievable for some, switching to e-cigarettes is certainly a less harmful alternative compared to continued smoking,” Lee advised.

Lastly, Bernard Stewart, a professor at the University of New South Wales in Sydney, emphasized the need for further research before implementing public health policies that may introduce additional e-cigarette regulations.