🟠 Moderate Evidence
Synthetic cooling ingredients commonly added to e-cigarettes cause abnormal heart rhythms and increase cardiovascular risk in laboratory models, according to new research published in Circulation: Arrhythmia and Electrophysiology. The study examined the effects of these cooling agents on both mice and lab-grown human heart cells, revealing concerning impacts on cardiac function.
Key takeaways
- Cooling ingredients in e-cigarettes caused abnormal heart rhythms in laboratory models
- Both mice and human heart cells showed increased cardiovascular risk measures
- Study adds to growing evidence of e-cigarette health risks beyond nicotine addiction
Study at a Glance
| Source | Circulation: Arrhythmia and Electrophysiology |
| Study type | Laboratory experimental study |
| Sample size | Mice and lab-grown human heart cells |
| Population | Laboratory models |
| Country | United States |
E-cigarette ingredients and cardiac effects
Laboratory study results on cooling agents
Source: Circulation: Arrhythmia and Electrophysiology, 2026 | Georgian Medical Journal News
Cooling agents trigger cardiac dysfunction
The research focused on synthetic cooling ingredients that manufacturers add to e-cigarettes to create menthol-like sensations without using natural menthol. These compounds, when tested on laboratory models, produced measurable changes in heart rhythm patterns and cellular function.
The study examined both whole-animal models using mice and isolated human cardiac cells grown in laboratory conditions. Both experimental approaches demonstrated similar patterns of cardiac dysfunction when exposed to the cooling ingredients.
Researchers observed that the cooling agents disrupted normal electrical conduction in heart tissue. This disruption manifested as irregular heartbeats and altered cardiac cell behavior, according to the American Heart Association’s classification of arrhythmias.
Laboratory findings raise safety concerns
The experimental results showed increased cardiovascular risk measures across multiple parameters in both mouse models and human cell cultures. The cooling ingredients appeared to interfere with normal cardiac electrophysiology, the study found.
These findings add to existing research on e-cigarette health impacts, which has primarily focused on respiratory effects and nicotine addiction. The cardiovascular implications of vaping ingredients have received less attention in previous research studies.
The laboratory nature of the study means the results require validation in human clinical trials before definitive safety conclusions can be drawn. However, the consistency of effects across different experimental models strengthens the preliminary evidence base.
Implications for e-cigarette regulation
The research contributes to ongoing discussions about e-cigarette ingredient safety and regulatory oversight. Current regulations vary widely between countries, with some focusing primarily on nicotine content rather than flavoring additives.
The US Food and Drug Administration continues to evaluate the safety profile of various e-cigarette components as part of its tobacco product review process. The European Union has implemented restrictions on certain flavoring compounds, but cooling agents remain under review.
Public health experts emphasize that laboratory findings require careful interpretation when developing policy recommendations. The regulatory landscape for e-cigarettes continues to evolve as new research emerges.
Cooling ingredients in e-cigarettes caused abnormal heartbeats and increased cardiovascular risk measures in both mice and lab-grown human heart cells
— Research team, Circulation: Arrhythmia and Electrophysiology (2026)
What this means
Frequently asked questions
What are cooling ingredients in e-cigarettes?
These are synthetic compounds added to create menthol-like sensations without using natural menthol. They provide a cooling effect when inhaled.
How serious are the heart rhythm problems found in the study?
The laboratory study showed abnormal heartbeats and increased cardiovascular risk measures, but human clinical trials are needed to determine real-world significance.
Should people stop using e-cigarettes with cooling ingredients?
The study provides preliminary evidence of potential risks, but individuals should consult healthcare providers for personalized advice about e-cigarette use.
While this laboratory research provides important preliminary evidence about potential cardiac risks from e-cigarette cooling ingredients, human clinical studies will be necessary to confirm these findings in real-world settings. The consistency of effects across different experimental models suggests the need for continued safety evaluation of vaping product ingredients beyond traditional tobacco components.
Source: Cooling ingredients in e-cigarettes may cause irregular heartbeat or cardiac arrest
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Medically reviewed by Prof. Giorgi Pkhakadze, MD, MPH, PhD. Spotted an error? Contact the editorial team.
