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A recent and extensive review of scientific research has concluded that vaping, including the use of e-cigarettes, likely contributes to the development of oral and lung cancers. Conducted by Professor Bernard Stewart and his team, the findings highlight a worrying trend in public health as vaping continues to rise in popularity, particularly among younger demographics.
The Growing Evidence Base
Historically, most investigations into the health impacts of vaping have centred on its role as a potential precursor to traditional tobacco smoking. While it is well-documented that individuals who vape are more prone to start smoking, the direct carcinogenic effects of vaping itself have remained ambiguous due to a lack of long-term studies.
However, the latest review, which scrutinised peer-reviewed literature published between 2017 and mid-2025, paints a concerning picture. The team focused on identifying health effects associated with vaping that align with the known characteristics of cancer-causing agents. They found that the aerosol inhaled by vapers contains a host of harmful chemicals, including nicotine and heavy metals, which exhibit nearly all ten key characteristics of carcinogens identified by the World Health Organization.
Key Findings on Vaping and Cancer
The research revealed that nicotine-based vaping products are likely to induce both oral and lung cancers. Blood and urine analyses from vapers indicated the absorption of carcinogenic substances, including metals from the heating elements and organic compounds derived from e-liquids.
Furthermore, DNA mutations were observed in the tissues of the mouth and lungs of vapers, providing further evidence of exposure to carcinogenic agents. The review also documented alterations in cancer biomarkers in these tissues, suggesting that changes at the molecular level precede tumour development. Such markers can manifest as inflammation observable under a microscope or as oxidative stress detectable through molecular analysis.
Animal studies further corroborated these findings, with experiments on mice demonstrating that exposure to vaping aerosols resulted in lung cancer. Dental professionals have also reported cases of oral cancers in patients who did not smoke but did use e-cigarettes, linking their conditions directly to vaping.
Shifts in Research Perspectives
The evolving narrative surrounding vaping and cancer risk is noteworthy. Research conducted between 2017 and 2019 frequently cited insufficient evidence to establish a link between vaping and cancer. However, by 2024 and 2025, there was a marked shift, with researchers increasingly voicing concerns that the notion of vaping being a safer alternative to smoking could no longer be upheld in light of accumulating evidence.
This comprehensive review represents a significant pivot in understanding the health risks posed by vaping as a standalone practice, rather than merely as a potential gateway to smoking.
The Path Forward: What Remains Unknown
Despite these alarming findings, definitive evidence linking vaping directly to an increased incidence of cancer remains elusive. The historical precedent set by tobacco research suggests that it could take decades to establish a clear causal relationship. This challenge is compounded by the need for studies that focus solely on individuals who exclusively vape, without the confounding factor of concurrent tobacco use.
To effectively monitor and identify cancer risks associated with vaping, robust and well-funded longitudinal studies are essential. Such research will not only clarify the extent of the risks but could also pave the way for early detection and prevention strategies that could save lives.
Why it Matters
The implications of these findings are profound, particularly as vaping continues to gain traction among young people globally. With the potential for e-cigarettes to serve as a new vector for cancer, public health policies must adapt swiftly to address this emerging threat. As society grapples with the dual challenges of nicotine addiction and cancer prevention, understanding the risks associated with vaping will be crucial for safeguarding future generations’ health.
