A major new study has raised serious concerns about the long-term dangers of vaping, with researchers now warning that nicotine-based e-cigarettes are likely linked to lung and oral cancer. For years, vaping has often been promoted as a “safer” alternative to traditional smoking, especially for people trying to quit cigarettes. But this latest review is challenging that belief in a major way and suggesting the health risks may be much more severe than many users previously thought.
The findings are already sparking fresh debate around whether vaping has been underestimated as a public health threat, particularly among younger people who may have started the habit believing it was relatively harmless. Experts behind the research say the evidence is now strong enough that people should stop thinking of e-cigarettes as a low-risk substitute for smoking.
Researchers Reviewed Years of Evidence
The study was led by researchers from the University of New South Wales in Sydney and examined scientific evidence published between 2017 and 2025 on the effects of nicotine-based e-cigarettes. Rather than simply comparing vaping to cigarette smoking, the team focused on whether vaping itself could directly contribute to cancer risk. That distinction is important because many earlier studies concentrated on whether vapes were “better than cigarettes” rather than whether they were dangerous on their own. According to the review, researchers analyzed a wide range of evidence, including laboratory studies, animal research, and human case reports. They concluded that vaping can trigger biological changes associated with cancer development, including DNA damage, inflammation, oxidative stress, and tissue injury in the respiratory system and mouth. Those changes are considered major warning signs because they can create the conditions that allow cancer to develop over time.
Why Scientists Are So Concerned
One of the biggest reasons the findings are causing alarm is that vaping products can expose users to harmful compounds beyond nicotine. Researchers pointed to carcinogenic chemicals found in e-cigarette aerosols, including volatile organic compounds and metals released from heating coils. The study also noted that vaping may damage respiratory tissue and alter the oral microbiome, both of which can increase inflammation and raise the likelihood of lung and oral cancers. The authors emphasized that while the exact cancer risk cannot yet be precisely measured, the warning signs are already strong. Because vaping has only been common for around two decades, scientists do not yet have the kind of long-term population data that took decades to build in smoking research. Even so, they argue there is enough evidence now to take the threat seriously instead of waiting years for more definitive numbers.
Dual Users May Face Even Greater Risk
The study also highlighted an especially troubling issue for people who both smoke cigarettes and vape. Researchers said dual use may significantly raise health risks rather than reduce them. According to reporting on the review, people who both smoke and vape could face a four-fold higher risk of developing lung cancer compared with people who only smoke or do neither. That finding adds to concerns that many users are not actually replacing cigarettes with vapes, but instead using both. This is especially important because many people originally turned to vaping believing it would help them quit smoking completely. Experts now warn that for some users, it may simply create a new layer of addiction and expose them to multiple harmful substances at once.
A Warning That Could Change Public Opinion
The researchers behind the study say the public should not repeat the same mistakes made with cigarettes decades ago, when early warning signs were ignored for too long. While vaping does not contain tar or carbon monoxide like cigarettes, experts say that does not make it safe. Instead, they argue the growing body of evidence shows it carries its own serious and potentially life-threatening risks. For now, the message from the study is clear: vaping should no longer be viewed as harmless, trendy, or “safe enough.” As more evidence continues to emerge, this latest research could become a major turning point in how the public views e-cigarettes and the hidden dangers they may carry.
