Each flavor has its own unique biological signature
Vaping altered 3,124 genes in regular users compared to non-users, with genetic changes more variable than in conventional smokers. Fruity flavors caused 31% of gene alterations, while multiple flavors combined caused 64.3%, suggesting each flavor has unique biological effects.
- 3,124 genes altered in regular vapers vs. non-users
- Fruity flavors associated with 31% of gene changes; multiple flavors combined with 64.3%
- Advanced devices (mods) showed strongest link to genetic alterations
- Cancer was the disease most strongly associated with detected changes
A study in Frontiers in Oncology found that frequent vaping alters 3,124 genes associated with cancer, with fruity flavors and advanced devices showing the strongest effects on gene expression.
A research team at USC has identified something troubling in the cells of people who vape regularly: alterations in more than 3,100 genes, many of them linked to cancer development. The study, published in Frontiers in Oncology, compared genetic activity in oral cells from 83 participants—some who vaped frequently, some who smoked traditional cigarettes, and some who used neither. What emerged was not just a simple dose-response relationship, but something more specific and perhaps more alarming: the particular flavoring in the vape liquid, and the type of device used, appeared to drive most of the genetic changes.
Ahmad Besaratinia, the lead researcher and a professor of public health sciences at USC's Keck School of Medicine, framed the central question his team set out to answer: What actually causes these molecular shifts? Is it the act of vaping itself, the frequency or duration, the specific products being used, or some combination? The answer, it turns out, points toward the product itself rather than the behavior alone.
Using RNA sequencing to measure the activity of thousands of genes simultaneously, the researchers found that regular vapers showed alterations in 3,124 genes compared to non-users. The genetic patterns were even more variable than those seen in conventional smokers—a finding that suggests vaping may produce a wider range of molecular disruptions depending on what is being vaped. But the real discovery lay in the details. When the team analyzed which specific factors drove the changes, they found that flavor profiles and device types accounted for roughly two-thirds of the observed alterations.
The breakdown was striking. Sweet flavors were associated with changes in 2.9 percent of the affected genes. Mint or menthol flavors showed up in 0.9 percent. But fruity flavors appeared in 31 percent of the gene alterations, and when multiple flavors were combined in a single product, the association jumped to 64.3 percent. Advanced, customizable devices known as mods showed the most consistent link to genetic changes. Besaratinia emphasized that each flavor appears to have its own unique biological signature—a finding with direct implications for how regulators should evaluate these products.
When the researchers performed a deeper analysis to identify which diseases and biological processes might be connected to these genetic alterations, cancer emerged as the condition most strongly associated with the changes detected in vapers. Endocrine disorders, gastrointestinal diseases, and various neurological conditions followed. The team was careful to note that the study does not prove vaping causes these diseases directly, only that it produces molecular modifications that have been previously linked to these conditions in other research.
The timing of this work is significant. U.S. health authorities are currently developing new regulatory guidelines for flavored e-cigarettes, and this research suggests those guidelines need to look beyond nicotine concentration. Besaratinia pointed out that regulators face a balancing act: weighing potential benefits for adult smokers trying to quit against risks to young people. But his team's findings suggest that flavored vaping products are associated with disease-related molecular changes regardless of the user's age. Many of the newest devices deliver higher nicotine doses and contain additives designed to enhance the user experience—some of which may have biological effects that remain poorly understood.
The research team is already working on the next phase: identifying which specific chemicals in vape liquids might be responsible for the genetic alterations they observed. Once those substances are pinpointed, policymakers could potentially require manufacturers to eliminate them or reduce their concentrations. That knowledge could reshape how these products are designed and sold, turning a molecular finding into a regulatory tool.
Notable Quotes
Each flavor has unique attributes that produce different biological effects, and regulators should carefully consider this when evaluating health risks of flavored e-cigarette products.— Ahmad Besaratinia, lead researcher, USC Keck School of Medicine
Flavored vaping products are associated with disease-related molecular changes regardless of the user's age, and regulatory evaluation should go beyond nicotine concentration to include specific ingredients and device design.— Ahmad Besaratinia
The Hearth Conversation Another angle on the story
So the study found changes in over 3,000 genes. Does that mean vaping causes cancer?
Not directly. The study identifies molecular changes that have been linked to cancer in previous research. It's showing a biological pathway, not proving causation. But it's significant because it suggests vaping isn't as inert as some people thought.
Why does flavor matter so much? It's just taste, right?
That's the assumption most people make. But the chemicals that create those flavors—especially fruity ones—appear to trigger different genetic responses in your cells. A mint flavor affects your genes differently than a strawberry flavor. Each one has its own chemical signature.
The study mentions that fruity flavors caused 31 percent of the alterations. That's huge compared to mint at less than 1 percent.
Exactly. And when you combine multiple flavors, it jumps to 64 percent. That suggests the chemicals aren't just additive—they interact in ways that amplify the effect. It's not about how much you vape; it's about what you're vaping.
What about the devices themselves? Why would a mod be different from a regular vape pen?
Mods are more powerful and customizable. They deliver higher temperatures, higher nicotine doses, and can be modified by users. The study found they showed the most consistent connection to genetic changes. It's not just the liquid; the delivery mechanism matters.
If regulators act on this, what would actually change?
Right now, regulations focus on nicotine levels and age restrictions. This research suggests they should also scrutinize specific flavoring chemicals and device designs. Manufacturers might have to reformulate products or limit certain ingredients. It could reshape the entire market.
Is there a next step?
Yes. The team is trying to identify which specific chemicals in the vape liquids are causing these genetic changes. Once they know that, they can tell regulators which ingredients to target. That's when policy could actually shift.