Vaping and E-Cigarettes: What We Know About the Health Risks

A Public Health Experiment in Real Time

When e-cigarettes entered the market, they were promoted as a safer alternative to traditional cigarettes and a tool for smoking cessation. Millions of people, including a generation of teenagers and young adults who might never have smoked conventional cigarettes, adopted vaping with the assumption that it was relatively harmless. But as years of data accumulate, the emerging picture is far more troubling than the marketing suggested.

At Zimmer Medical Group, we are seeing the health effects of vaping in our patient population, and we believe patients deserve clear information about what the science actually shows rather than what vape manufacturers claim. The honest summary from public health authorities is straightforward: e-cigarettes are not safe, the long-term risks are still being learned, and for anyone who does not already smoke there is no health reason to start.

What Is in Vape Liquid?

E-cigarettes heat a liquid (often called e-liquid or vape juice) to create an aerosol that users inhale. It is worth clearing up one piece of language right away: what you exhale is not water vapor. It is an aerosol, a fine suspension of chemicals, flavoring agents, and metal particles small enough to travel deep into the lungs. Vape liquid typically contains:

Nicotine

Most e-liquids contain nicotine, and many contain far more than users realize. A single JUUL pod, for example, was marketed as containing roughly as much nicotine as a pack of 20 cigarettes. Newer devices and high-strength nicotine-salt e-liquids can deliver nicotine more smoothly and efficiently than traditional cigarettes, which makes them easy to use heavily and intensely addictive.

Propylene Glycol and Vegetable Glycerin

These are the base liquids that create the visible vapor. While generally recognized as safe for oral consumption, their safety when heated and inhaled repeatedly into the lungs has not been established. When overheated, these carrier liquids can break down into irritants and carbonyl compounds such as formaldehyde, a known carcinogen.

Flavoring Chemicals

Thousands of flavoring chemicals are used in e-liquids. Many are approved for food use but have never been tested for inhalation safety, and eating a flavoring is a very different exposure from breathing it deep into the lungs. Diacetyl, a buttery flavoring chemical, was linked to "popcorn lung" (bronchiolitis obliterans) in factory workers who inhaled it occupationally. While some manufacturers have removed diacetyl, many other flavoring chemicals remain untested for pulmonary safety.

Heavy Metals

The heating coils in e-cigarettes can leach heavy metals including nickel, lead, chromium, and manganese into the aerosol. These metals can accumulate in lung tissue and are associated with respiratory and cardiovascular toxicity. Research has found elevated levels of some of these metals in samples from e-cigarette users, and the amounts tend to rise as coils age and run hotter.

Other Toxic Compounds

Independent laboratory analyses have identified formaldehyde, acrolein (a compound that irritates and damages lung tissue), benzene, and ultrafine particles in e-cigarette aerosol. The concentrations vary by device, temperature setting, and e-liquid composition, but their presence across products is consistent, and higher-powered devices run at temperatures that tend to generate more of these byproducts.

EVALI: E-Cigarette or Vaping Product Use-Associated Lung Injury

In 2019, a nationwide outbreak of severe lung injuries linked to vaping products brought the risks into sharp focus. EVALI (E-cigarette or Vaping product use-Associated Lung Injury) hospitalized thousands and killed dozens of people, many of them young and previously healthy.

According to the Centers for Disease Control and Prevention, EVALI was strongly linked to vitamin E acetate, a thickening agent used mainly in THC-containing vape products obtained from informal or illicit sources. However, cases also occurred in people who reported using only nicotine products, which tells us that other components of e-cigarette aerosol can also injure the lungs.

EVALI symptoms include cough, shortness of breath, chest pain, nausea, vomiting, diarrhea, fever, and fatigue, and they can come on over days to weeks. Severe cases required supplemental oxygen, mechanical ventilation, and intensive care. Removing vitamin E acetate from products brought the acute outbreak under control, but the CDC continues to advise against using informal or street-sourced vaping products, and EVALI remains a stark demonstration that inhaling heated chemical mixtures carries serious, sometimes life-threatening risk.

What Vaping Does to Your Lungs Over Time

EVALI is the dramatic, acute face of vaping injury, but the everyday effects on the airways matter just as much. Even without a headline-making illness, regular vaping irritates the delicate lining of the airways and can produce:

• Chronic cough, throat irritation, and increased phlegm
• Wheezing and chest tightness, especially with exertion
• Worsening of asthma, with more frequent flares and rescue-inhaler use
• Shortness of breath that creeps up gradually and is easy to blame on being out of shape

The airways are lined with tiny hair-like structures called cilia that sweep out mucus, debris, and germs. Both nicotine and other aerosol components can impair this clearance system, which may leave the lungs more vulnerable to infection. Because e-cigarettes have only been in widespread use for about 15 years, we do not yet know how many long-term users will go on to develop chronic obstructive conditions, but the biological signals are concerning and they echo the early warning signs we once ignored with cigarettes. If you already live with reactive airways, our guide to managing asthma and COPD in humid St. Pete covers how to keep flares under control, and vaping works directly against every one of those strategies.

Cardiovascular Effects

Emerging research shows that vaping is not only a lung issue; it measurably stresses the cardiovascular system:

• Nicotine from e-cigarettes increases heart rate and blood pressure, acutely stressing the cardiovascular system with each use
• E-cigarette aerosol impairs blood vessel function, reducing the ability of arteries to dilate properly (endothelial dysfunction), a key early step in atherosclerosis
• Vaping is associated with increased arterial stiffness, a marker of cardiovascular aging
• Platelet activation increases after vaping, which can raise the tendency to form blood clots
• Sympathetic nervous system activation from nicotine promotes chronic strain on the heart

Research reported through the American Heart Association has linked regular e-cigarette use with a meaningfully higher risk of heart attack and coronary artery disease compared with non-users. While these risks appear lower than those of combustible cigarettes, they are far from negligible, particularly for young people who may vape for decades. Knowing the early warning signs of a heart attack is worthwhile for anyone, and it is doubly so if you use nicotine in any form.

Nicotine Addiction: Especially Concerning in Young Adults

Nicotine is one of the most addictive substances known, and e-cigarettes deliver it efficiently and pleasurably. This is particularly concerning for adolescents and young adults:

• The adolescent brain is uniquely vulnerable to addiction. Nicotine exposure during brain development (which continues until approximately age 25) can alter the reward system and increase the likelihood of lasting addiction.
• E-cigarettes can be a gateway to nicotine dependence. Many young people who start vaping develop a nicotine dependence they never would have acquired through cigarettes, which are increasingly socially unacceptable.
• Withdrawal symptoms are real and significant. Irritability, anxiety, difficulty concentrating, insomnia, and intense cravings make quitting hard once addiction is established.
• Dual use is common. Many people who vape also smoke traditional cigarettes, either because they could not fully quit or because they began smoking after becoming addicted to nicotine through vaping.

Comparison to Traditional Cigarettes

It is important to contextualize the risks honestly:

• E-cigarettes likely expose users to fewer toxic compounds than combustible cigarettes, which burn tobacco and produce thousands of chemicals through combustion, including tar and carbon monoxide.
• "Safer than cigarettes" is a low bar. Being less toxic than one of the most dangerous consumer products ever sold does not make something safe or healthy.
• The long-term effects of vaping are still unknown. Cigarettes were widely considered acceptable for decades before the full extent of their harm was understood. The chronic diseases vaping may contribute to, including cancer, COPD, and cardiovascular disease, take decades to develop.
• For non-smokers, there is no upside. If you do not currently smoke, taking up vaping introduces health risks with zero benefit.

The Dual Use Problem

Many smokers who switch to e-cigarettes keep smoking conventional cigarettes as well. This "dual use" pattern is a particular concern because:

• It may not reduce health risks meaningfully compared with smoking alone
• It maintains nicotine addiction at high levels
• It reduces the motivation to quit nicotine entirely
• Some research suggests dual users may have worse respiratory outcomes than people who only smoke

For e-cigarettes to serve as a genuine harm-reduction tool, a smoker needs to switch completely, and even then the ultimate goal should be to quit nicotine altogether.

Myths vs. Facts

• Myth: Vaping is just harmless water vapor. Fact: The aerosol contains nicotine, fine and ultrafine particles, flavoring chemicals, and traces of metals, not water.
• Myth: Vaping is completely safe because it is not smoking. Fact: Not burning tobacco removes some toxins, but "not as bad as cigarettes" is not the same as safe.
• Myth: Nicotine-free vapes are risk-free. Fact: The base liquids, flavorings, and heating byproducts still irritate the airways, and many products labeled nicotine-free have tested positive for nicotine.
• Myth: Vaping is an easy, proven way to quit smoking. Fact: E-cigarettes are not FDA-approved cessation aids, and many people who try to quit with them end up using both. Approved medications and counseling have the strongest evidence.
• Myth: EVALI was solved, so vaping is fine now. Fact: Removing vitamin E acetate ended the acute outbreak, but the everyday risks to the lungs, heart, and brain remain.

When to See Your Doctor

Most people who vape will not develop a dramatic illness, but certain symptoms deserve prompt medical attention. Contact your doctor, or seek urgent care, if you or someone you know who vapes develops:

• Shortness of breath, chest pain, or a persistent cough that is new or worsening
• Fever, chills, nausea, vomiting, or diarrhea occurring together with breathing symptoms, which can signal a vaping-associated lung injury
• Wheezing or asthma attacks that are becoming more frequent or harder to control
• Palpitations, a racing heartbeat, or lightheadedness
• Signs of nicotine dependence, such as needing to vape first thing in the morning, feeling anxious or irritable without it, or being unable to cut back despite wanting to

Please be honest with your physician about vaping. There is no judgment in our office, and we cannot help you manage risks we do not know about. If you are not sure how to raise it, our guide on how to talk to your doctor can make the conversation easier.

A St. Pete Perspective on Vaping and Lung Health

Living on Florida's Gulf Coast adds a few local wrinkles to the vaping conversation.

• Our air already challenges sensitive lungs. Between year-round pollen, high humidity, and occasional red tide blooms that irritate the airways, many Pinellas County residents already deal with more respiratory irritation than they would in a drier climate. Vaping adds a daily, self-inflicted irritant on top of the environmental ones, and patients often notice their cough or chest tightness is worse on high-pollen or red-tide days.
• Heat, dehydration, and nicotine. Nicotine constricts blood vessels and nudges up heart rate and blood pressure, which is not what you want when a Gulf Coast summer heat index is already taxing your cardiovascular system. Staying hydrated and out of peak heat matters even more for people who use nicotine.
• A young, active community. St. Petersburg's beaches, breweries, and social scene skew young, and vaping is common in exactly the age group whose brains are still most vulnerable to nicotine's grip. If you started vaping socially, you are not alone, and it is worth addressing before it becomes a decades-long habit.

The goal here is not alarm. It is to notice that our local environment gives St. Pete residents extra reasons to keep their lungs and hearts as unburdened as possible.

Cessation Resources

If you vape and want to quit, or if you smoke and are considering e-cigarettes as a quitting tool, talk to your healthcare provider first. Evidence-based cessation methods include:

• Nicotine replacement therapy (NRT): Patches, gum, and lozenges provide controlled nicotine doses to manage cravings and withdrawal
• Prescription medications: Varenicline and bupropion are FDA-approved medications that significantly improve quit rates
• Behavioral counseling: Individual or group counseling addresses the psychological and behavioral sides of addiction
• Quitlines: Free telephone and text support (1-800-QUIT-NOW) is available to anyone
• Programs for young people: The Truth Initiative runs a free text-based program designed specifically to help teens and young adults quit vaping
• The American Lung Association: Offers comprehensive resources, support programs, and a free helpline

The most effective approach usually combines medication with behavioral support. For a fuller walkthrough of what actually works, see our guide to what works for quitting in 2026. Your doctor can help you build a personalized quit plan around your specific patterns, triggers, and needs.

Frequently Asked Questions

Is vaping safer than smoking cigarettes? For someone who already smokes and switches completely, vaping likely exposes the lungs to fewer toxins than burning tobacco. But "fewer toxins than cigarettes" is not the same as safe, and for a non-smoker vaping only adds risk.

Are nicotine-free vapes harmless? No. Even without nicotine, the base liquids, flavoring chemicals, and heating byproducts irritate the airways, and testing has repeatedly found nicotine in products labeled nicotine-free.

Can vaping help me quit smoking? E-cigarettes are not FDA-approved as quit-smoking aids, and many people who try them end up using both products. FDA-approved medications combined with counseling have the strongest track record. Talk to your doctor before relying on vaping to quit.

Is secondhand vapor a concern? Exhaled aerosol is not harmless air. It can contain nicotine and fine particles, so it is reasonable to avoid vaping around children, pregnant women, and people with heart or lung conditions.

I only vape occasionally. Do I still need to worry? Occasional use is lower risk than daily use, but nicotine's pull toward more frequent use is strong, and even intermittent vaping irritates the airways. If you can stop while it is still occasional, that is the easiest time to do it.

What We Tell Our Patients

Our guidance at Zimmer Medical Group is straightforward:

1. If you do not vape or smoke, do not start. There is no health benefit to inhaling any substance into your lungs beyond air.
2. If you smoke cigarettes, quitting entirely is the best option. FDA-approved cessation methods have the strongest evidence. If you cannot quit cold turkey, discuss all options with your doctor, including whether a temporary, structured transition to e-cigarettes might have a role in your quit plan.
3. If you vape, work toward quitting. The long-term risks are unknown, the addiction is real, and the known short-term effects on your lungs and cardiovascular system are concerning.
4. Be honest with your doctor about vaping. We cannot help you manage health risks we do not know about.

Trying to quit vaping or smoking? Contact Zimmer Medical Group to discuss evidence-based cessation strategies tailored to your situation. Quitting is hard, but you do not have to do it alone.