Editorial Note
VapesOnlineShop is a vape retailer, not a medical authority. This page compiles findings from the CDC, FDA, Johns Hopkins, the American Lung Association, and peer-reviewed research. We present the evidence as it stands — including the risks. Nothing here is medical advice. If you have health concerns, consult your doctor.
The short answer: vaping is not risk-free. E-cigarette aerosol contains nicotine (in most products), ultrafine particles, and chemical compounds that can affect your lungs and cardiovascular system. At the same time, major health bodies — including Public Health England and the Royal College of Physicians — have stated that vaping is substantially less harmful than smoking combustible cigarettes, though "less harmful" does not mean "safe."
This page breaks down what the science actually says as of 2026 — organized by body system, with sources cited — so you can make informed decisions.
What's in E-Cigarette Aerosol?
When you vape, you're not inhaling water vapor. You're inhaling an aerosol generated by heating e-liquid. The CDC identifies these substances commonly found in e-cigarette aerosol:
Nicotine — present in the vast majority of e-liquids at concentrations typically between 2% (20mg/ml) and 5% (50mg/ml). Nicotine is highly addictive and raises heart rate and blood pressure. It is especially harmful to adolescent brain development, which continues until approximately age 25. However, nicotine itself is not the primary cause of smoking-related cancers — that role belongs to the combustion byproducts in cigarette smoke.
Propylene glycol (PG) and vegetable glycerin (VG) — the base liquids that produce visible aerosol. Both are FDA-approved for oral consumption in food products. However, the FDA has not evaluated them for long-term inhalation safety. When heated at high temperatures, PG and VG can break down into formaldehyde and acetaldehyde, both classified as carcinogens. The amount produced depends heavily on device temperature and coil condition — overheated or burnt coils produce significantly more.
Flavoring compounds — hundreds of flavoring chemicals are used across the industry. The most studied concern is diacetyl, linked to bronchiolitis obliterans ("popcorn lung") when inhaled in industrial settings. While diacetyl has been removed from most major brands, many flavoring compounds have not been tested for inhalation safety. The FDA's PMTA (Premarket Tobacco Product Application) process is gradually requiring manufacturers to submit toxicological data.
Heavy metals — trace amounts of nickel, tin, lead, and chromium have been detected in some e-cigarette aerosols. A 2021 Johns Hopkins study identified thousands of chemical ingredients in vape products, many not yet fully characterized. Metal exposure is typically linked to coil degradation — newer mesh coil technology in modern devices may reduce but not eliminate this.
Health Effects by Body System
Lungs and Respiratory System
E-cigarette aerosol contains ultrafine particles that penetrate deep into the lungs and can cause inflammation. The American Lung Association reports that pneumonia, bronchitis, and other respiratory infections occur more frequently in people who vape. Short-term effects include coughing, throat irritation, and shortness of breath — particularly common when first starting.
The 2019 EVALI (E-cigarette or Vaping Product Use-Associated Lung Injury) outbreak in the U.S. hospitalized over 2,800 people and caused 68 deaths. The CDC's investigation linked nearly all cases to vitamin E acetate in illicit THC cartridges — not to commercial nicotine e-cigarettes. This distinction is critical: EVALI was a contamination issue in unregulated products, not a consequence of standard nicotine vaping. No similar outbreak occurred in the UK, where e-cigarettes are more tightly regulated.
Long-term respiratory effects remain uncertain because the product category is relatively new. As Johns Hopkins pulmonologist Dr. Panagis Galiatsatos has noted, smoking-related diseases like COPD and emphysema typically take 20–30 years to develop — and commercial vaping has only existed for roughly 15 years.
Heart and Cardiovascular System
Nicotine — regardless of delivery method — constricts blood vessels, raises blood pressure, and increases heart rate. These effects elevate cardiovascular risk. The American Heart Association states that e-cigarette aerosol is not harmless, and that people with existing heart conditions should avoid nicotine products entirely.
That said, the Royal College of Physicians' review found that the cardiovascular risks of nicotine delivered through e-cigarettes are substantially lower than those from smoking, because combustion-generated carbon monoxide and oxidizing chemicals — primary drivers of smoking-related heart disease — are absent from e-cigarette aerosol.
Brain and Nicotine Addiction
Nicotine is one of the most addictive substances available. It acts on the brain's reward system, creating dependence that makes quitting difficult. The CDC emphasizes that nicotine is particularly harmful to developing brains in adolescents and young adults (under 25), potentially affecting attention, learning, mood, and impulse control.
Modern disposable vapes typically contain 5% (50mg/ml) nicotine salt — delivering nicotine absorption comparable to combustible cigarettes. Devices with lower nicotine strengths (2–3%) are available and may be appropriate for users actively reducing their intake. Some brands, including RAZ and Geek Bar, also offer 0mg nicotine-free options.
Oral Health
Emerging research suggests vaping can affect oral health. Nicotine reduces blood flow to gum tissue, and some e-liquid ingredients may promote bacterial growth. Dry mouth — a common vaping side effect — also increases cavity risk. Dental professionals recommend staying hydrated and maintaining regular checkups if you vape.
Vaping vs. Smoking: What the Data Shows
This is the comparison most adult users care about, and the evidence is relatively clear on this point — though it comes with important caveats.
| Factor | Cigarettes | E-Cigarettes |
|---|---|---|
| Combustion | Yes — produces tar, CO, 7,000+ chemicals | No — heats liquid, no combustion |
| Known carcinogens | 70+ identified | Some present at much lower levels |
| Nicotine delivery | Yes (combustion-dependent) | Yes (heating-dependent) |
| Carbon monoxide | Significant levels | Not present |
| Tar | Yes | Not present |
| Secondhand exposure | Well-documented harm | Limited evidence of harm; still under study |
| Long-term data | Decades of evidence | ~15 years; long-term unknowns remain |
| Annual U.S. deaths | 480,000+ (CDC) | No comparable figure established |
The CDC states that e-cigarette aerosol "generally contains fewer harmful chemicals than the deadly mix of 7,000 chemicals in smoke from regular cigarettes." Public Health England's landmark review concluded that vaping is roughly 95% less harmful than smoking — a figure that remains widely cited but also debated. The key nuance: "less harmful" is relative to one of the deadliest consumer products ever created. It does not mean harmless.
The Bottom Line on Relative Risk
If you don't smoke and don't vape, don't start either. If you currently smoke, switching entirely to vaping reduces your exposure to known harmful chemicals — but continuing to do both ("dual use") may provide little benefit. The American Heart Association and FDA both recommend FDA-approved cessation methods (patches, gum, varenicline) as first-line quitting tools, with e-cigarettes as a less-studied alternative.
Who Should Not Vape
Every major health organization agrees on these groups:
Non-smokers — if you don't already use nicotine, there is no health reason to start vaping. The risks are all downside with no offsetting benefit.
Anyone under 21 — federal law prohibits sale of all tobacco and vaping products to individuals under 21. Nicotine causes lasting harm to developing brains. VapesOnlineShop enforces age verification on all orders.
Pregnant or breastfeeding women — nicotine is toxic to fetal development. The CDC and FDA both advise against any nicotine product during pregnancy.
People with existing heart or lung conditions — nicotine's cardiovascular effects and aerosol's respiratory impact pose elevated risks for these populations.
Reducing Risk If You Choose to Vape
For adult users who have made an informed decision, these evidence-based practices can reduce (but not eliminate) exposure to harmful compounds:
Use regulated, commercially manufactured products. The 2019 EVALI crisis was traced to illicit, contaminated cartridges. Buying from authorized retailers who sell commercial products with proper labeling is a basic safety measure. For information about product authenticity, see our Geek Bar ingredients, RAZ ingredients, or Foger ingredients pages.
Avoid burnt hits. Overheated coils produce higher levels of formaldehyde and other aldehydes. If you taste burning, stop immediately. Replace pods or devices promptly. For device-specific guidance, see our usage guides: Foger, Geek Bar, RAZ, Lost Mary.
Consider lower nicotine strengths. If you're not using vaping to transition from cigarettes, lower nicotine levels (2–3% or 0%) reduce both addiction potential and cardiovascular effects. Zero-nicotine options exist: RAZ Zero Nicotine, Geek Bar 0mg, and our full nicotine-free guide.
Don't modify devices or use homemade liquids. Modifying hardware or filling devices with substances they weren't designed for increases risks dramatically.
The Regulatory Landscape (2026)
The FDA's PMTA process requires manufacturers to demonstrate that their products are "appropriate for the protection of public health." As of early 2026, very few e-cigarette products have received full marketing authorization. Most products on the U.S. market remain under FDA enforcement discretion while applications are reviewed.
State-level regulations vary significantly — from flavor bans in some states to minimal restrictions in others. For a state-by-state breakdown, see our Vape Laws by State 2026 guide, updated monthly.
Frequently Asked Questions
Is vaping safer than smoking cigarettes?
The scientific consensus is that vaping exposes users to fewer toxic chemicals than cigarette smoking, which produces tar, carbon monoxide, and 7,000+ chemicals through combustion. The CDC states e-cigarette aerosol "generally contains fewer harmful chemicals" than cigarette smoke. However, "safer than cigarettes" does not mean safe — e-cigarettes still deliver nicotine and other potentially harmful substances.
What are the most common side effects of vaping?
Common short-term effects include throat and mouth irritation, coughing, headaches, dry mouth, and dizziness (especially for new users or those using high nicotine concentrations). These often decrease as the body adjusts. More concerning effects — like persistent cough, chest pain, or shortness of breath — should be discussed with a healthcare provider promptly.
Does vaping cause popcorn lung?
Bronchiolitis obliterans ("popcorn lung") has been linked to inhaling diacetyl, a flavoring chemical. While diacetyl was found in some early e-cigarette products, most major manufacturers have since removed it. No confirmed case of popcorn lung has been directly attributed to commercial e-cigarette use. That said, not all flavoring chemicals have been fully tested for inhalation safety.
What was EVALI and should I be worried?
EVALI (E-cigarette or Vaping Product Use-Associated Lung Injury) caused over 2,800 hospitalizations and 68 deaths in 2019. The CDC's investigation identified vitamin E acetate — an additive in illicit THC cartridges — as the primary cause. It was not linked to commercial nicotine e-cigarettes purchased from legitimate retailers. Using regulated products from authorized sources is the most effective way to avoid this specific risk.
Is nicotine-free vaping safe?
Nicotine-free vaping eliminates nicotine's cardiovascular effects and addiction potential. However, you're still inhaling heated aerosol containing PG, VG, and flavoring compounds — none of which have been thoroughly studied for long-term inhalation effects. Nicotine-free vaping is less risky than nicotine vaping, but "less risky" is not the same as "risk-free."
Can vaping help me quit smoking?
Some studies suggest e-cigarettes can be effective as a smoking cessation tool when used as a complete replacement — not alongside cigarettes. A UK clinical trial found higher quit rates for e-cigarette users compared to nicotine replacement therapy at 12 months. However, the FDA has not approved any e-cigarette as a cessation device. The American Heart Association recommends trying FDA-approved methods first (patches, gum, varenicline). If you're considering vaping to quit smoking, consult your doctor for personalized guidance.
Sources
CDC — Health Effects of E-Cigarettes (cdc.gov/tobacco/e-cigarettes/health-effects.html) · Johns Hopkins Medicine — 5 Vaping Facts You Need to Know (hopkinsmedicine.org) · American Lung Association — Health Risks of E-Cigarettes (lung.org) · American Heart Association — Is Vaping Safer Than Smoking? (heart.org) · Cleveland Clinic — Vaping: What It Is, Side Effects & Dangers (my.clevelandclinic.org) · Cancer Research UK — Is Vaping Harmful? (cancerresearchuk.org) · Public Health England — E-cigarettes: An Evidence Update, 2015 · Royal College of Physicians — Nicotine Without Smoke, 2016 · National Academies of Sciences — Public Health Consequences of E-Cigarettes, 2018