Vaping and Asthma: What South African Respiratory Specialists Actually Say (2026)
If you have asthma and currently smoke cigarettes, switching to vaping is likely to reduce your exposure to the combustion chemicals most directly responsible for triggering and worsening asthma attacks. However, vaping is not risk-free for people with asthma — the aerosol itself can irritate already-sensitive airways, and dual use (vaping while still smoking) carries the same or greater risk than smoking alone. The consensus among respiratory specialists is that vaping is a harm-reduction tool for smokers with asthma, not a safe activity for non-smokers with asthma.
South Africa has one of the highest burdens of asthma on the African continent. Recent data from the Global Asthma Network has found a high prevalence of asthma and a striking increase in severe symptoms in adolescents in Cape Town, with a large proportion of children largely undiagnosed — as many as 66% going without a formal diagnosis. South Africa has the fourth-highest asthma mortality in the general population at 1.5 per 100,000, and the fifth-highest asthma mortality among 5–35-year-old asthmatics at 18.5 per 100,000.
For South Africans living with this condition — and for the family members who care for them — the growing availability of vaping products raises an urgent and deeply personal question: is vaping safe if you have asthma? And if you're a smoker with asthma, is switching to vaping better or worse for your lungs?
This article presents what the latest peer-reviewed research actually shows, contextualised for the South African respiratory landscape and framed around the guidance that respiratory specialists are giving their patients in 2026.
First: Why Asthma and Smoking Are Especially Dangerous Together
To understand what vaping means for asthmatic lungs, you first need to understand what smoking does to them — because this is the baseline against which vaping is measured.
Asthma is a chronic inflammatory condition in which the airways are already hypersensitive. The bronchial tubes of an asthmatic person are in a constant state of low-level inflammation, with a hair-trigger response to irritants, allergens, and airborne particles. Tobacco smoke is one of the most potent bronchial irritants known — it contains over 7,000 chemicals produced by combustion, dozens of which directly cause or worsen airway inflammation, mucus production, and bronchospasm.
For an asthmatic smoker, cigarettes create a vicious cycle: smoke triggers inflammation, inflammation worsens airway sensitivity, and worsened sensitivity means the next cigarette — or even exposure to a mild environmental irritant like dust or cold air — triggers a more severe response.
In South Africa, asthma is partly controlled or uncontrolled in 60.3% of patients, with 46.1% experiencing at least one severe exacerbation in the 12 months before study visits. For those who smoke, this figure is significantly worse.
What the Latest Research Says About Vaping and Asthma
The most comprehensive and current evidence on this topic comes from multiple large-scale systematic reviews and meta-analyses published in 2024 and 2025. The findings are nuanced — and it's important to distinguish between three very different groups:
- Non-smokers with asthma who vape
- Smokers with asthma who switch completely to vaping
- Smokers with asthma who use both cigarettes and vaping (dual users)
The research findings for each group are meaningfully different.
Group 1: Non-Smokers with Asthma Who Vape
This is the group where the evidence is most clearly cautionary.
A 2025 review published in the European Journal of Medical Research found that e-cigarette usage increases the risk of developing chronic airway inflammatory diseases. Specifically, studies showed that e-cigarettes exacerbate airway inflammatory responses, elevate levels of type 2 inflammatory cytokines, increase cellular oxidative stress, and impair lung function.
A 2025 narrative review covering 74 studies published in PubMed, Scopus, Web of Science, and Embase found that e-cigarette use causes both acute and chronic respiratory injury. Acute effects include airway inflammation, oxidative stress, and epithelial barrier disruption, while chronic exposure is linked to persistent inflammation and increased risk of asthma.
For a person who has never smoked and already has asthma, respiratory specialists' guidance is clear: vaping introduces unnecessary airborne irritants into airways that are already hypersensitive. There is no therapeutic benefit that would justify this for a non-smoker. The aerosol produced by vaping — while dramatically less toxic than tobacco smoke — is not inert air, and asthmatic airways can respond to it.
The respiratory specialist consensus for non-smokers with asthma: do not vape.
Group 2: Smokers with Asthma Who Switch Completely to Vaping
This is where the evidence is most favourable for vaping — and it is the scenario most relevant to South African asthmatic smokers looking for a way out of cigarettes.
A systematic review by Glantz et al., explored in a 2025 umbrella review published in Sage Journals, indicated improvements in asthma and COPD symptoms for current exclusive e-cigarette use compared to smoking.
The mechanism is logical: when a smoker with asthma switches completely to vaping, they immediately stop inhaling the combustion byproducts — carbon monoxide, tar, polycyclic aromatic hydrocarbons, and hundreds of other compounds — that are the primary drivers of tobacco-related airway inflammation. The bronchial tubes, freed from this ongoing assault, begin to reduce their inflammatory response.
A 2025 meta-analysis published in Tobacco Induced Diseases found that current vapers who had switched from smoking had a lower incident risk of respiratory symptoms compared to non-vaper current smokers, with a relative risk of 0.75 (95% CI: 0.64–0.89). In plain language: exclusive vapers had 25% lower risk of developing new respiratory symptoms compared to people who continued smoking cigarettes.
For an asthmatic smoker, complete switching to vaping is associated with:
- Reduction in the frequency and severity of asthma attacks
- Less reliance on rescue inhalers (SABA)
- Improved morning breathing
- Reduced airway mucus production
- Better overall asthma control scores in clinical studies
The respiratory specialist consensus for smokers with asthma: complete switching to vaping is preferable to continued smoking, but should ideally be a step toward quitting all nicotine products rather than a permanent substitution.
Group 3: Dual Users (Smoking and Vaping Simultaneously)
This group carries the worst outcomes of all three — and it is the scenario that respiratory specialists warn against most urgently.
The same 2025 meta-analysis found that dual users had a relative risk of respiratory symptoms 2.53 times higher than never-users (95% CI: 1.44–4.45), and their risk was statistically similar to people who only smoked cigarettes.
The study also found that dual users had significantly higher risk of COPD compared to never users, with a relative risk of 3.86 (95% CI: 1.49–10.02).
The reason dual use is so harmful for asthmatics is that it combines the full toxic load of cigarette combustion with the additional airway irritation of vaping aerosol. There is no respiratory benefit to dual use — it does not reduce the harm of smoking, it adds to it.
If you have asthma and you are currently both smoking and vaping with the intention of cutting down on cigarettes, your respiratory specialist's primary advice will be to make the transition to vaping complete, or to use vaping as a bridge to full cessation, rather than using both indefinitely.
Specific Vaping Components That Concern Respiratory Specialists for Asthmatic Patients
Even for asthmatic smokers who have switched completely to vaping, respiratory specialists monitor several specific components of e-liquid and vaping aerosol:
Flavouring Compounds
Certain flavouring chemicals used in e-liquids have been associated with respiratory irritation. Diacetyl — a butter-flavouring compound linked in occupational settings to a condition called bronchiolitis obliterans — was found in some early e-liquid formulations. Reputable e-liquid manufacturers operating under quality standards have largely removed diacetyl from their products, but it remains a concern in unregulated or counterfeit products.
For asthmatic vapers, choosing e-liquids from established, quality-assured local manufacturers — rather than unbranded imports of unknown composition — is a meaningful harm-reduction step.
Propylene Glycol (PG)
PG is one of the two base ingredients in virtually all e-liquids. In most people it is well tolerated, but it is a known mild airway irritant in some individuals. Research from respiratory specialists has found that inhaled aerosols can irritate the airway lining, leading to chronic coughing, wheezing, or shortness of breath, even in people with no prior lung disease. For asthmatics who already have sensitive airways, higher PG ratios may trigger irritation.
Asthmatic vapers often do better on high-VG (vegetable glycerine) e-liquids — such as 70VG/30PG blends — which produce smoother, less irritating aerosol. This is a practical harm-reduction recommendation many respiratory physicians make to their asthmatic patients who are using vaping to quit smoking.
Nicotine
Nicotine itself has a complex relationship with asthma. At high concentrations, nicotine causes airway constriction — a concern for asthmatic airways. However, the nicotine delivered through vaping enters the bloodstream more gradually and at lower peak concentrations than from a cigarette, meaning the acute bronchoconstrictive effect is typically less pronounced than from smoking.
For asthmatic vapers, gradually reducing nicotine concentration in their e-liquid over time — the standard harm-reduction step-down approach — also gradually reduces this bronchoconstrictive effect.
Secondhand Aerosol
A 2024 retrospective study of 54 children aged 5–17 years with asthma found that those exposed to secondhand e-cigarette aerosol from parents at home experienced higher exacerbations and required more rescue therapy, though findings were not statistically significant due to the small sample size.
If you vape and live with someone who has asthma — particularly a child — the guidance from respiratory specialists is clear: do not vape in enclosed shared spaces. Vape outside or in well-ventilated areas, treat your aerosol with the same consideration you would give to secondhand smoke, and prioritise the respiratory health of vulnerable household members.
What South African Respiratory Context Adds to This Picture
South African asthmatic patients face unique environmental stressors that compound the question of vaping's impact:
Air quality: Durban in particular is one of the most heavily polluted urban areas in South Africa, with high rates of asthma-related respiratory symptoms — 37–40% self-reported wheezing prevalence among adults in some communities. South African asthmatics already have highly sensitised airways from industrial and traffic pollution. Any additional airway irritant — cigarette smoke or vaping aerosol — must be considered against this elevated baseline.
Underdiagnosis: In low- and middle-income countries like South Africa, as many as 50% of asthma cases may be undiagnosed at the population level. Many South Africans who experience wheeze, shortness of breath, and exercise intolerance may have undiagnosed asthma and may not realise their airways are already compromised before they start vaping.
Medication adherence: In South Africa, 74.9% of asthmatic patients were prescribed three or more SABA canisters in the previous 12 months, indicating poor baseline asthma control. An asthmatic smoker who switches to vaping and experiences improvement in asthma symptoms as a result may also need to work with their doctor to reassess and adjust their maintenance medication.
Practical Guidance: If You Have Asthma and You Smoke or Vape
Based on the current evidence and the clinical guidance respiratory specialists provide to asthmatic patients, here is a practical summary:
If you have asthma and you smoke: The evidence strongly supports switching completely to vaping as a harm-reduction measure. Complete switching — not dual use — is associated with improved asthma symptom control and reduced reliance on rescue inhalers. Work with your doctor to monitor your asthma management plan as your breathing changes.
If you have asthma and you currently vape: Choose high-VG e-liquids to reduce airway irritation. Avoid flavoured e-liquids with complex chemical flavouring profiles, particularly from unverified sources. Gradually step down your nicotine concentration over time. Inform your respiratory specialist that you vape — this is relevant clinical information for your asthma management.
If you have asthma and you do not smoke or vape: Do not start vaping. There is no respiratory benefit for non-smokers with asthma, and the evidence suggests vaping introduces measurable airway irritation to already-sensitive bronchial tissue.
If you have asthma and you dual use (smoke and vape): Prioritise making the transition to exclusive vaping complete. Dual use carries the worst respiratory outcomes of the three scenarios and provides none of the harm-reduction benefit of complete switching. Your respiratory specialist and your vape supplier can help you find the right device and nicotine strength to make cigarettes unnecessary.
If you live with an asthmatic person: Never vape indoors or in enclosed shared spaces. The evidence on secondhand aerosol exposure is cautionary, particularly for children with asthma.
The Comparison That Matters Most
| Scenario | Relative Respiratory Risk vs. Never-User |
|---|---|
| Non-smoker who vapes | Elevated risk of airway symptoms (RR ~1.90) |
| Smoker who does not vape | Elevated risk of symptoms (baseline comparison) |
| Dual user (smokes + vapes) | Highest risk — similar to smoking alone (RR ~2.53 for symptoms, ~3.86 for COPD) |
| Former smoker who switched exclusively to vaping | Lower risk than continuing to smoke (RR ~0.75) |
Source: Kundu et al., Tobacco Induced Diseases, November 2025. Meta-analysis of 119 studies.
Frequently Asked Questions
Is vaping safe if you have asthma? No inhaled aerosol is completely safe for asthmatic airways. However, the risk profile is very different depending on whether you are a smoker switching to vaping (where the evidence supports harm reduction) or a non-smoker considering vaping (where the evidence does not support starting).
Can vaping trigger an asthma attack? Yes, in some individuals. Vaping aerosol can irritate hypersensitive airways and trigger bronchospasm, particularly in people with poorly controlled asthma or in those vaping high-PG liquids. Using high-VG e-liquids and avoiding strong flavourings reduces this risk.
Is vaping better than smoking for asthma? For smokers with asthma who switch completely to vaping, the evidence suggests yes — exclusive vapers have lower rates of new respiratory symptoms than smokers. However, dual use (smoking and vaping together) is as harmful as or worse than smoking alone.
Should I tell my respiratory specialist I vape? Yes, absolutely. Vaping is clinically relevant information for asthma management. Your specialist needs to know in order to properly assess your breathing, adjust your medication, and monitor your progress accurately.
What e-liquid is best for asthma? Choose high-VG (vegetable glycerine) e-liquids — 70VG/30PG or higher — from reputable manufacturers with transparent ingredient disclosure. Avoid products from unverified sources that may contain undisclosed flavouring compounds. Gradually reduce nicotine concentration over time.
Is secondhand vaping dangerous for asthmatics? The evidence is still developing, but existing studies suggest that secondhand e-cigarette aerosol can worsen asthma symptoms, particularly in children. Vaping should not be done in enclosed spaces shared with asthmatic individuals.
The Bottom Line
Vaping and asthma is not a simple story. The evidence in 2026 is nuanced, context-dependent, and still evolving — and respiratory specialists will tell you exactly that.
What is clear is this: if you are a South African smoker with asthma, continuing to smoke is the worst option for your lungs. Switching completely to vaping removes the combustion chemicals most responsible for triggering your asthma, and the evidence supports this as a meaningful harm-reduction step. What is equally clear is that vaping is not recommended for non-smokers with asthma, and dual use carries no respiratory benefit whatsoever.
At Downtown Vapoury, we work with asthmatic customers to find the gentlest, most appropriate vaping setup for their needs — including high-VG e-liquids, smooth MTL devices, and appropriate nicotine strengths that make the transition from cigarettes sustainable. We are not doctors, and we always recommend that you discuss any change in your nicotine habits with your respiratory specialist. But we can help you make that change as smooth and effective as possible.
Visit us in Durban, Umhlanga, or Salt Rock — or shop online.
This article is for informational purposes only and does not constitute medical advice. If you have asthma or any other respiratory condition, consult your doctor or respiratory specialist before making any changes to your smoking or vaping habits. All research referenced in this article is from peer-reviewed publications current as of early 2026.