E-Cigarettes: The Surprising Truth About What You’re Really Inhaling

E-cigarettes have exploded in popularity. Users skyrocketed from 7 million globally in 2011 to 82 million in 2021. An estimated 1.63 million middle and high school students use e-cigarettes as of 2024. Many people believe these devices are safe alternatives to traditional smoking, but the reality is far more concerning. We need to understand the side effects e-cigarettes can cause and the health risks of e-cigarettes before making assumptions about their safety. This piece will explore e cigarettes chemicals you’re inhaling, get into whether e cigarettes cause cancer, and provide a clear comparison of cigarettes vs e cigarettes to help you understand what you’re putting into your body.

What’s Actually Inside E-Cigarettes

“nearly 2,000 chemicals, the vast majority of which are unidentified.” — Johns Hopkins University, Research Institution

The liquid inside e-cigarettes contains much more than you might expect. Research has identified approximately 2,000 different types of chemicals in vape liquids. A detailed review found 22 chemicals present in both e-liquids and aerosols.

Nicotine Content and Concentration

Nicotine levels in e-cigarettes vary dramatically. Studies show the average nicotine content sits at 11 mg/ml. Concentrations range from 0 mg/ml to over 25 mg/ml. Between January 2017 and March 2022, the monthly average nicotine strength increased from 2.5% to 4.4%. Disposable e-cigarettes showed the sharpest increase, with nicotine content jumping by 2,364.5%. Some products claiming to be nicotine-free contain measurable nicotine. Researchers detected nicotine in 5 allegedly nicotine-free samples at concentrations that ranged from 0.11 mg/ml to 6.9 mg/ml.

Propylene Glycol and Vegetable Glycerin

These two compounds form the bulk of e-liquid formulations. Glycerol averages 37 g/100 g, and propylene glycol averages 57 g/100 g. The FDA classifies these substances as “generally recognized as safe” for ingestion. No health authority has labeled propylene glycol safe for inhalation. Studies found that both PG and VG aerosols reduce ciliary beating and cause mucus hyperconcentration. They also increase inflammatory cytokine expression. Research on mice exposed to PG/VG showed fat globules that built up in lungs and impaired immune systems. The mice had increased vulnerability to infections.

Flavoring Chemicals and Additives

Over 7,000 e-cigarette flavors exist. Researchers identified 219 unique flavoring ingredients added to more than 100 e-liquids. The most used were vanillin (present in 35% of liquids) and ethyl maltol (32%). Diacetyl, a chemical linked to bronchiolitis obliterans (popcorn lung), was detected in 39 of 51 flavors tested. Total flavoring chemicals range from 1-4% by weight.

Heavy Metals and Toxic Particles

Metal parts in contact with e-liquid contaminate it during heating. A 2020 review found aluminum, antimony, arsenic, cadmium, cobalt, chromium, copper, iron, lead, manganese, nickel, selenium, tin, and zinc in e-cigarette aerosol. Lead was present in 100% of e-liquid samples. Nickel appeared in all but one of these samples. One disposable e-cigarette released more lead during a day’s use than nearly 20 packs of traditional cigarettes.

Carcinogens Found in E-Cigarette Aerosol

Formaldehyde was present in 100% of samples that identified it. Other carcinogens detected include acetaldehyde and benzene. These compounds increase risks of asthma and squamous cell carcinoma. They also raise the likelihood of nasopharyngeal cancer, Hodgkin’s lymphoma, and leukemia.

Health Risks of E-Cigarettes

Using e-cigarettes triggers a cascade of serious health problems in multiple body systems. Research reveals these devices pose risks way beyond what most people realize.

Respiratory Problems and Lung Damage

EVALI (e-cigarette or vaping product use-associated lung injury) emerged in 2019. It resulted in 2,807 cases and 68 deaths. More than 50% of EVALI patients require intensive care admission. The condition causes symptoms that include shortness of breath, cough, chest pain and fever. Diacetyl in flavoring chemicals causes bronchiolitis obliterans (popcorn lung) and leads to permanent lung scarring. E-cigarettes also trigger collapsed lungs and lipoid pneumonia from inhaling oily substances. Chemical damage to small airways can cause constrictive bronchiolitis.

Does E-Cigarettes Cause Cancer

The long-term cancer risk remains uncertain. But biomarker evidence shows e-cigarette exposure causes DNA damage, oxidative stress and cellular apoptosis. Formaldehyde in aerosol can bind to DNA and contribute to nasopharyngeal and lung cancer risk. No major incident lung cancer risk was found in never-smoker current vapers. Case reports document cancer development in long-term users though.

Cardiovascular Effects

People who vape are 56% more likely to have a heart attack than non-smokers. E-cigarette use increases heart attack risk by 53%. Former smokers who vape show 2.52-fold higher odds. Users face 19% higher risk of developing heart failure. Vaping raises blood pressure from 122/72 mm Hg to 127/77 mm Hg and increases heart rate by 4 beats per minute.

Effect on Brain Development

Nicotine harms adolescent brain development and affects regions that control learning, mood, attention and impulse control. Young people who vape show higher ADHD symptoms and double the odds of depression.

Side Effects E-Cigarettes Users Experience

Common side effects include coughing, shortness of breath, dry mouth and throat irritation.

Cigarettes vs E-Cigarettes: The Real Comparison

Comparing these two products reveals a complex picture that challenges simple assumptions about relative safety.

Chemical Exposure Differences

Traditional cigarettes contain about 7,000 chemicals when burned, while e-cigarettes contain around 2,000. Research that measured biomarkers shows exclusive e-cigarette users had 10% to 98% substantially lower concentrations of tobacco-specific nitrosamines, polycyclic aromatic hydrocarbons, most volatile organic compounds, and nicotine compared with cigarette smokers. E-cigarette users had about 93% lower nicotine metabolites, while NNAL (a carcinogen marker) was 98% lower. But metal concentrations and three VOCs (toluene, benzene, carbon disulfide) remained similar between both groups. One analysis found cigarette smoke contained between 9 and 450 times more toxins than e-cigarette vapor.

Addiction Potential

Studies present conflicting findings on addiction potential. Research on young adults found nicotine dependence levels measured by FTND were over two times higher among e-cigarette users (mean 3.5) compared to traditional smokers (mean 1.6). Dual users showed higher dependence with e-cigarettes (mean 4.7) versus cigarettes (mean 3.2). One pod from certain vape products contains 0.7 mL of nicotine, equivalent to about 20 regular cigarettes.

Long-Term Health Outcomes

Scientists acknowledge we lack complete long-term data on e-cigarette health effects. Dual use of both products may result in greater toxin exposure and worse health outcomes than using either alone. Both products cause blood vessel dysfunction, though through different mechanisms.

Common Misconceptions About Safety

Between 82% and 83% of smokers believed vaping was equally or more harmful than cigarettes, which is incorrect. While vaping poses a small fraction of smoking’s risks in the short and medium-term, it remains unsafe.

The Hidden Dangers of Vaping

“The recent lung illness outbreak has alarmed physicians and the broader public health community and shined a light on the fact that we have very little evidence about the short- and long-term health consequences of e-cigarettes and vaping products.” — Patrice A. Harris, MD, MA, AMA President

Regulatory failures have created a dangerous marketplace where most products lack proper oversight. Research shows that illegal e-cigarette products lacking FDA authorization constitute 86.3% of the market. NJOY, VUSE, and Logic brands have received marketing authorization for just 34 products.

Unregulated Products on the Market

U.S. stores sell more than 5,800 types of disposable vapes, representing a 1,500% increase from 356 in 2020. Illegal, unauthorized products account for 70% of e-cigarette sales in the U.S..

The Risk of Unknown Ingredients

Vaping aerosols contain thousands of unknown chemicals that manufacturers do not disclose, including industrial chemicals and caffeine. Counterfeit products may contain undeclared hazardous ingredients. Some fake vapes contain traces of fentanyl and methamphetamine. Black-market cartridges often do not contain the nicotine amount specified on labels.

Second-Hand Vapor Exposure

Exposure to secondhand e-cigarette aerosol among middle and high school students rose from 24.2% to 44.5% between 2015 and 2020. Secondhand aerosol contains nickel, chromium, formaldehyde, and acetaldehyde. Youth with asthma who were exposed to secondhand aerosol had higher odds of reporting an asthma attack.

Youth Targeting and Marketing Tactics

E-cigarettes are used by more than 1.6 million middle and high school students, with 90% using flavored products. High school students who vape do so frequently (20 or more days of the past 30), with this group representing 40% of all student vapers. E-cigarette companies target youth through social media. Students who use social media report seeing e-cigarette content 73% of the time. Students in 2022 reported seeing tobacco ads on TV and other mediums 75% of the time.

Conclusion

E-cigarettes might seem like a safer alternative to traditional smoking, but the reality is much more complex. We’ve explored how these devices expose you to thousands of chemicals, heavy metals, and carcinogens. The lack of long-term research and widespread unregulated products make vaping a risky choice. Think over what you’re inhaling and the potential risks for your health before you pick up an e-cigarette. Make informed decisions based on facts, not marketing claims.

FAQs

Q1. What chemicals are actually found in e-cigarette vapor? E-cigarette vapor contains approximately 2,000 different chemicals, including nicotine, propylene glycol, vegetable glycerin, flavoring agents, heavy metals (like lead, nickel, and chromium), and carcinogens such as formaldehyde and acetaldehyde. Many of these chemicals remain unidentified, and metal contamination occurs when heating elements come into contact with the e-liquid.

Q2. Can vaping cause serious lung damage? Yes, vaping can cause severe respiratory problems including EVALI (e-cigarette or vaping product use-associated lung injury), which has resulted in thousands of hospitalizations and deaths. Other lung conditions linked to vaping include bronchiolitis obliterans (popcorn lung), collapsed lungs, lipoid pneumonia, and permanent lung scarring. Common symptoms include shortness of breath, coughing, and chest pain.

Q3. Are e-cigarettes actually safer than traditional cigarettes? While e-cigarettes contain fewer chemicals than traditional cigarettes (around 2,000 versus 7,000), they are not safe. E-cigarette users show significantly lower levels of certain toxins compared to cigarette smokers, but they still face serious health risks including heart attacks, cardiovascular problems, and potential cancer development. The lack of long-term research makes it difficult to fully assess their safety.

Q4. How does vaping affect heart health? Vaping significantly impacts cardiovascular health. People who vape are 56% more likely to have a heart attack than non-smokers and face a 19% higher risk of developing heart failure. E-cigarette use raises blood pressure and increases heart rate by approximately 4 beats per minute, putting additional strain on the cardiovascular system.

Q5. Why is vaping particularly dangerous for young people? Nicotine in e-cigarettes harms adolescent brain development, affecting areas that control learning, mood, attention, and impulse control. Young vapers show higher rates of ADHD symptoms and double the odds of depression. Additionally, over 1.6 million middle and high school students currently use e-cigarettes, with nearly 90% using flavored products that are specifically marketed to appeal to youth.