Mitochondrial dysfunction as a central mechanism in e-cigarette toxicity
Published in Protocols & Methods, Cell & Molecular Biology, and Biomedical Research
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Review article
Mitochondrial dysfunction induced by E-cigarettes
Where this started
Reading across the literature, the same signals kept appearing. One paper focused on oxidative stress, another on inflammation, another on metabolic disruption. Each was valid, but they rarely spoke to each other.
The question became unavoidable:
Are these really separate effects, or are they fragments of the same underlying process?
Why mitochondria?
Mitochondria are not just energy producers. They sit at the center of cellular decision-making, integrating stress signals, controlling metabolism, and regulating cell survival.
They are also unusually exposed. Their DNA sits close to the electron transport chain, constantly near reactive oxygen species, with limited repair capacity. That combination makes them both essential and fragile.
This made them a logical place to look for convergence.
What the evidence kept pointing to
Across different models and exposure systems, a pattern started to stabilize.
- Reactive oxygen species accumulate quickly after exposure
- Mitochondrial DNA shows signs of damage and instability
- Energy production drops as respiration becomes inefficient
- Membrane potential collapses, and calcium balance shifts
- Inflammatory signals amplify the damage rather than resolve it
What stood out was not any single mechanism, but how tightly they connect.
Once mitochondrial stress begins, it tends to sustain itself.
The part that complicates the narrative
Not all effects trace back neatly to nicotine. In many cases, flavoring chemicals and thermal degradation products appear to be more disruptive.
Aldehydes such as cinnamaldehyde interfere directly with mitochondrial metabolism. Metals from device components introduce additional oxidative burden. These exposures overlap and interact, making the system harder to interpret using single-factor explanations.
This complexity is often underestimated.
Why this perspective matters
Looking at mitochondria shifts the discussion.
Instead of asking:
- Does vaping affect the lungs?
- Does it affect the heart?
- Does it affect metabolism?
The question becomes:
What happens when cellular energy systems are persistently stressed?
From that angle, the downstream effects start to align more naturally across organ systems.
What still feels unresolved
Most of the current evidence comes from controlled systems: cells, animals, short-term exposures. These are useful, but they do not fully capture real-world patterns.
There are also methodological gaps:
- Mitochondrial dysfunction is often inferred rather than directly measured
- Exposure conditions vary widely across studies
- Long-term adaptation versus damage is still unclear
It is possible that early mitochondrial stress triggers adaptive responses. It is also possible that repeated exposure prevents recovery. Right now, both scenarios remain open.
Where this leads
This work does not close the question. It reframes it.
If mitochondrial dysfunction is a central node, then:
- Different toxicants may converge on the same biological outcome
- Seemingly unrelated diseases may share a common upstream trigger
- Interventions could target mitochondrial resilience rather than isolated pathways
That shift, from isolated effects to system-level disruption, is where the field may need to move next.
Reference
Sailis AB, Noh MABM, Leo BF, Faruqu FN, Yee A, Sim MS. Mitochondrial dysfunction induced by e-cigarettes. Toxicology. 2026;519:154339. https://doi.org/10.1016/j.tox.2025.154339
Ardie Barry Sailis is a PhD researcher in pharmacology and toxicology at the University of Malaya, studying how environmental exposures affect human health at the molecular and cellular levels. His work combines experimental and integrative approaches to understand how chemical exposures disrupt normal biological function. He has contributed to research on cellular stress, metabolic regulation, and tissue function, with a focus on how these processes relate to disease. His research aims to connect molecular changes with broader physiological outcomes to better understand mechanisms of toxicity.
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This is exactly the kind of integrative perspective the field needs. Rather than focusing on isolated organ-level effects, you address what occurs when the cellular energy system is exposed to persistent stress — a shift that fundamentally reframes downstream biological outcomes.
What stands out is the self-sustaining nature of the cascade described. Once mitochondrial stress is initiated, it does not simply accumulate damage but can reorganize the system toward a new, dysfunctional equilibrium. This distinction is critical for intervention strategies, as it implies the existence of thresholds beyond which targeting isolated pathways may no longer be sufficient.
Your emphasis on flavoring agents and thermal degradation products is particularly relevant. The evidence suggests that the biological burden of e-cigarette exposure is chemically diverse and exposure-dependent — not reducible to nicotine alone — which significantly challenges simplified “reduced harm” narratives.
The open question you raise — adaptive response versus loss of recovery capacity — is, in our view, central. From a biophysical systems perspective, once reactive oxygen species exceed mitochondrial antioxidant capacity, progressive inefficiencies in the electron transport chain may emerge, compromising ATP production. At that stage, the system may lose its ability to maintain global energetic balance, and stress can transition from reversible to structurally embedded.
This type of dynamic — where mitochondrial dysfunction precedes and potentially drives systemic instability — may be interpreted within a broader biophysical coherence framework, which we have formalized and explored across domains. For further detail:
https://doi.org/10.17605/OSF.IO/FYQGS
Thank you for a rigorous and genuinely valuable contribution.
C.J. Pérez Pulido | ISHEA Institute
Thank you for the thoughtful engagement and for sharing your work. I agree that framing these effects in terms of system behavior and limits helps explain why outcomes diverge across exposure conditions and why recovery is not always straightforward.
Your broader perspective is useful in thinking about how localized mitochondrial disruption could propagate into wider instability, which is an area that likely needs more explicit investigation.
Thank you for your thoughtful response — I truly appreciate it.
I completely agree: framing these effects at the systems level, especially in terms of thresholds and adaptive limits, helps explain why similar exposures can lead to very different outcomes.
From our perspective, the key point is precisely that:
localized mitochondrial disruption may not remain local.
Once energetic efficiency drops beyond a certain threshold, the system can shift into a new functional state, where instability propagates across scales — from cellular processes to tissue-level behavior.
This is where we believe further work is needed, particularly in understanding:
👉 how these transitions occur
👉 and when reversibility is no longer guaranteed
Your work is a valuable contribution in that direction.
Looking forward to seeing how this field evolves.