Researchers at the University of Southern California’s Keck School of Medicine have discovered that vaping alters 3,124 genes across the human genome, with fruit-flavored e-liquids and high-powered “mod” devices driving the vast majority of this genetic damage. This critical finding arrives as regulators like the FDA finalize policies on flavored tobacco products, providing early biological evidence of long-term health risks.
While chronic diseases take decades to develop, changes in gene expression offer early warnings of potential harm. Surprisingly, the study found that 66.6% of these genetic changes were linked to flavor and device type, whereas only 28.8% related to how often or how much a person vaped.
By analyzing oral cell samples, researchers mapped how different flavors disrupt gene regulation. The genetic impact varied wildly across flavor profiles:
- Sweet flavors: Linked to 2.9% of affected genes.
- Mint or menthol flavors: Linked to 0.9% of affected genes.
- Fruit flavors: Linked to 31% of affected genes.
- Multiple flavors (mixed): Linked to 64.3% of affected genes.
The study also issued a stark warning regarding advanced refillable devices, or “mods.” These higher-generation vapes were associated with the most severe changes in gene regulation, likely because they deliver higher nicotine levels and contain potentially toxic additives designed to make vaping smoother.
Senior author Professor Ahmad Besaratinia emphasized that these disease-related molecular changes occur regardless of the user’s age. The research team urges regulators to evaluate e-cigarettes more granularly, focusing on eliminating specific harmful chemical compounds rather than applying broad-brush policies.