Vaping and Your Heart: What the Evidence Really Says

A patient came into clinic last month wanting to talk about his blood pressure. He had quit cigarettes three years earlier, which is the kind of news every cardiologist loves to hear. Then he mentioned, almost as an aside, that he was still vaping. He had switched from Marlboros to a pod system because he understood vaping to be the safer alternative, and now he was using it through most of the day. He wanted to know if that was fine. He thought he had basically solved the problem.

I see versions of this in clinic constantly. The smoker who switched and feels relieved. The parent who found a disposable vape in their teenager's backpack and does not know how worried to be. The casual vaper who only uses it on weekends and assumes the occasional puff cannot do much. Every one of them is asking the same underlying question: how bad is this for my heart?

The honest answer is that vaping is probably less harmful than smoking cigarettes, and it is not harmless. Those two facts have to live together. The trick most patients fall into is comparing vaping to smoking, finding it favorable, and concluding it is safe. That is a comparison error. The right comparison is vaping versus not vaping, and the data on that comparison are not friendly.

What Is Actually in the Vapor

The marketing for these devices leans hard on the word "water vapor." There is almost no water in it. What you are inhaling is a mixture of nicotine, carrier liquids, flavoring chemicals, and trace metals from the device itself, all heated and turned into a fine mist that reaches deep into your lungs.

The carrier liquids are propylene glycol and vegetable glycerin. They are considered safe to eat. We have very little data on what they do to your lungs and blood vessels when you inhale them several hundred times a day. The flavoring chemicals are an even bigger black box. Cinnamaldehyde, diacetyl, and others have been linked in lab studies to inflammation in airway and blood vessel cells. They were approved for food, not for inhalation, and the regulatory framework for inhaled flavors barely exists.

Then there are the metals. The heating coil inside a vape is usually made of nickel-chromium alloy or a similar metal blend. As the coil heats, it sheds tiny amounts of nickel, chromium, and sometimes lead and antimony into the vapor you inhale. A 2024 Johns Hopkins analysis of popular disposable vapes found that several of them released metal levels exceeding what regulators consider safe for inhalation, and the levels actually went up as the device aged. Lead is bad news because the lungs absorb it efficiently into the bloodstream, where it can damage blood vessels and the kidneys.

You are also inhaling tiny particles you breathe in along with everything else, the same kind of fine particles that make air pollution dangerous to the heart. The cardiovascular research on outdoor air pollution is substantial, and it consistently shows that breathing fine particles raises the risk of heart attack, stroke, and arrhythmia. Vaping is essentially a personal source of these particles, delivered directly to your airways.

One more thing patients ask about. Different products give wildly different exposures. A cheap disposable from a gas station, a refillable mod with adjustable wattage, and a sealed pod system from a major brand do not deliver the same chemical mix or the same nicotine dose. The variation is large enough that we cannot give you a single average number for any of these exposures.

What Nicotine Does to the Heart

Nicotine is the part of vaping that does the most direct work on your cardiovascular system, and it does plenty.

Within a few minutes of a puff, nicotine reaches your brain and triggers a release of adrenaline. Your heart rate climbs, often by ten to twenty beats per minute. Your blood pressure rises. Your blood vessels narrow, including the small arteries that feed your heart muscle. The fight-or-flight system fires up, and your body behaves as if you were under threat.

Nicotine also makes your blood more likely to clot. Platelets, the cells that form clots, become stickier when nicotine is around. The lining of blood vessels stops working properly, meaning the vessels do not relax and dilate the way they should when your heart needs more oxygen. Over time, repeated exposure makes that lining stiffer and less responsive, which is one of the early steps toward atherosclerosis.

All of this happens whether the nicotine arrived through a cigarette, a vape, a patch, or a piece of gum. Cigarettes do extra damage on top of these nicotine effects from carbon monoxide, tar, and other combustion products. The nicotine effects, though, are real and present in every nicotine-delivery method, vapes included.

What the Studies Actually Show

There are three layers of evidence on vaping and the heart, and I want to walk through them because patients often hear about one and miss the others.

Acute studies: what one session of vaping does

The clearest data come from short experimental studies in human volunteers. Researchers bring people into a lab, have them vape for fifteen or thirty minutes, and measure what happens. Across many of these studies, vaping a typical session raises blood pressure, raises heart rate, stiffens the arteries, and impairs the way blood vessels relax in response to demand. These changes show up within thirty minutes and persist for at least an hour or two. They look very similar to what you see after a cigarette, though usually a little smaller in size.

Importantly, these changes happen even in young, otherwise healthy adults who had never smoked. The argument that vaping only affects people who already have damaged hearts does not hold up.

Mid-term studies: what regular vaping does to blood vessels

When researchers look at people who have been vaping for months or years, the picture is similar. Regular vapers have worse blood vessel function on testing than non-users. Their arteries are stiffer. Their endothelium, the inner lining that controls how vessels expand and contract, does not respond as well as a non-vaper's. Some studies have found that the lining of blood vessels works about as poorly in chronic vapers as it does in chronic smokers.

There is also early evidence that chronic vaping promotes inflammation in the body. Markers of cell damage from harmful molecules go up. Some immune cells become more active. None of this is proof of long-term harm by itself, and all of it is consistent with the early steps that lead to atherosclerosis and heart attacks down the road.

Population studies: do vapers actually have more heart attacks

This is where the data are messiest, and where I want to be careful with you. Several large surveys, including a long-running American survey of nearly 50,000 adults, have looked at whether people who vape are more likely to have had a heart attack or stroke than people who do not. Early analyses suggested that yes, vapers had more cardiovascular events. Some of those analyses had real methodological problems, including one widely cited paper that was retracted because most of the heart attacks in the data had occurred before people started vaping. The retraction matters, and it has been used in some quarters to argue that vaping is harmless. That argument goes too far.

Better analyses with more careful timing have continued to find a signal. People who use both cigarettes and vapes have worse cardiovascular outcomes than people who only smoke, which suggests vaping adds to the harm rather than subtracting from it. People who vape and have never smoked appear to have a higher risk of heart attack than people who have never used either, though the absolute numbers are still small because most vapers are young.

The honest caveat is that long-term outcome data are still maturing. Vaping became common roughly ten to fifteen years ago. We do not yet have the kind of decades-long follow-up that we have for cigarettes. The American Heart Association's 2023 scientific statement on vaping makes exactly this point. The early signals are concerning. The full ledger will take more years to settle.

The Quitting-Smoking Question

If you currently smoke cigarettes, vaping is a reasonable bridge off them. A British randomized trial of about 900 smokers found that those given a refillable vape were almost twice as likely to quit cigarettes at one year compared with those given nicotine patches and gum. That is a real effect and a meaningful one. For a heavy smoker who has tried and failed with patches, switching to a vape may be the difference between continuing to smoke and getting off cigarettes for good. As a cardiologist I would always rather you vape than smoke.

The catch in that same trial is sobering. Of the people who quit smoking using vapes, eighty percent were still vaping a year later. Of the people who quit using patches and gum, only about nine percent were still using nicotine replacement at a year. Vapes are very effective at getting you off cigarettes, and they are also very effective at keeping you on nicotine indefinitely. The product is engineered to be pleasant. Patches and gum are engineered to be tolerable. Tolerable is easier to walk away from.

My recommendation to patients who switched from cigarettes to vaping is the same one I give my own family. The first step is real progress. The second step matters too. Pick a date in the next few months where you start tapering down the nicotine concentration in your vape. Cut from a high-strength pod to a medium one for a few weeks, then to a low one, then to nicotine-free. When you can comfortably go several hours without reaching for it, you are most of the way there. Behavioral support and medications can help with both stages.

Teen Vaping

If you are a parent reading this, here is what you should know.

First, the brain is still wiring itself until somewhere around age twenty-five, and nicotine is unusually good at hijacking that wiring. Adolescent brains exposed to nicotine become addicted faster, more deeply, and at lower doses than adult brains. A teenager who vapes for a year can easily develop a pattern of dependence that takes a decade to unwind. The same person, starting at thirty, would have a much easier time stopping.

Second, nicotine in adolescence is not just an addiction issue. Studies have linked early nicotine use to changes in attention, learning, impulse control, and mood. There is a clear correlation between heavy teen vaping and anxiety and depression, and while the direction of cause and effect is not fully nailed down, the association shows up in study after study.

Third, the products that dominate the teen market are designed in ways that maximize uptake. Flavored disposable vapes deliver high doses of nicotine in formulations that are smooth and easy to inhale. The packaging looks like a USB drive or a highlighter. The flavors are candy and fruit. None of this is accidental, and the result is millions of American teens with a daily nicotine habit. The Surgeon General has called teen vaping a public health epidemic, and the language is appropriate.

Practical advice for parents. If you find a vape, treat it the way you would treat any other addictive substance, with calm and concern, not panic. Most teens who vape do not want to be addicted. Many of them are relieved when an adult takes the problem seriously. Your pediatrician can help, and so can resources like Truth Initiative's text-based quit program for teens, which is free.

EVALI: A Different Kind of Vaping Injury

In late 2019, hospitals across the country started seeing young people show up acutely short of breath, with diffuse damage on lung imaging, often requiring intensive care and sometimes ventilator support. The CDC counted about 2,800 hospitalizations and 68 deaths before the outbreak faded. The condition got the name EVALI, which stands for e-cigarette or vaping product use-associated lung injury.

EVALI turned out to be mostly driven by THC vape cartridges from the illicit market, contaminated with vitamin E acetate, an oily thickening agent that some manufacturers were adding to make the cartridges feel more potent. When inhaled and heated, vitamin E acetate appears to coat and damage the lungs. The CDC found vitamin E acetate in the lung fluid of EVALI patients but not in the lungs of healthy controls.

EVALI is a distinct problem from the cardiovascular concerns I have been describing. It was a lung-injury epidemic from a specific contaminant, not a heart-disease epidemic from regular vape use. It is worth knowing about for two reasons. First, the illicit THC vape supply is still out there, and a fresh wave of contamination could happen again. Second, it shows what kind of damage an unregulated inhaled product can do when something goes wrong upstream.

So Should You Quit?

Here is how I think about it for the three groups of patients I started with.

If you currently smoke cigarettes: switching to a vape is better than continuing to smoke. It is not as good as quitting nicotine entirely. Use the vape as a tool to get off cigarettes, then plan a taper off the vape itself. Six months to a year of vaping while you stabilize off cigarettes is a reasonable arc. Lifelong vaping is not.

If you do not smoke and do not vape: do not start. There is no upside. The downside is real even if it is not yet fully measured.

If you have been vaping casually or recreationally without a smoking history: there is no good reason to keep going. You took up an exposure with cardiovascular consequences that we are still learning about. The kindest thing you can do for your future self is to put the device down.

Practical Paths to Quit

Quitting nicotine is hard, and it is harder if you try to do it on willpower alone. The combinations that work best in practice are medication plus behavioral support.

On the medication side, varenicline (the brand name Chantix is no longer sold in the US, but generic varenicline is back on the market as of 2024) is the most effective single drug we have. It cuts cravings and blocks the reward from nicotine. Bupropion is another option, often a good fit for patients who also struggle with depression. Nicotine replacement therapy in the form of patches plus a short-acting product like gum or lozenges is well-tolerated and roughly doubles your odds of quitting compared with no help. Some patients combine nicotine replacement with varenicline under their doctor's guidance.

On the behavioral side, the free 1-800-QUIT-NOW line connects you to your state's tobacco quitline, where trained counselors will help you set a quit date and walk you through the first weeks. The American Lung Association's Freedom From Smoking program is another solid resource. Truth Initiative's This Is Quitting program is designed for younger vapers and works through text messages. None of these costs anything.

Plan for the first two weeks to be the hardest. Caffeine sometimes hits differently after you stop nicotine, so consider cutting back on coffee for a few weeks. Hydration helps. So does any kind of physical activity that gets you breathing harder, even a long walk. The cravings are intense and they do not last. They typically peak in the first week, ease through the second week, and become occasional rather than constant by the second month.

What to Watch for While You Are Still Using

If you currently vape and you have any of the following, get evaluated rather than waiting. New chest pressure or chest pain, especially with activity. Shortness of breath that is new or worsening. Palpitations or a sense that your heart is racing or skipping. Lightheadedness or fainting. Persistent cough, fever, or sudden severe shortness of breath, which can be early signs of vaping-related lung injury.

Also worth flagging in your annual visit: if your blood pressure has been creeping up, if your resting heart rate is higher than it used to be, or if your sleep has gotten worse. These are subtle clues that nicotine is doing measurable work on your cardiovascular system, and they are reasons to revisit the conversation about quitting.

A Closing Thought

The patient I started this article with, the one who switched from Marlboros to a pod system, came back six months later. He had cut his nicotine concentration in half and was reaching for the device less often. His blood pressure was lower. He was sleeping better. He still considered the original switch from cigarettes the most important step, and he was right. He was also clear that the next step was getting off the vape entirely, and he had a plan for it.

That is the right arc. Vaping is a tool, useful in some hands, harmful in others, and not a destination. If you are using one, ask yourself honestly whether it is moving you toward a future without nicotine or anchoring you to one. The answer should shape what you do next.

References

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2. Wold, Loren E., Jacob A. Tarran, Aruni Bhatnagar, et al. "Cardiopulmonary Impact of Electronic Cigarettes and Vaping Products: A Scientific Statement From the American Heart Association." Circulation 148, no. 8 (2023): 703-728.

3. Jenssen, Brian P., Susan C. Walley, Rachel Boykan, Alice Little Caldwell, and Deepa Camenga. "Cardiopulmonary Consequences of Vaping in Adolescents: A Scientific Statement From the American Heart Association." Circulation 146, no. 4 (2022): e205-e221.

4. Hajek, Peter, Anna Phillips-Waller, Dunja Przulj, et al. "A Randomized Trial of E-Cigarettes versus Nicotine-Replacement Therapy." New England Journal of Medicine 380, no. 7 (2019): 629-637.

5. Berlowitz, Joshua B., Yuelong Xie, Anna Krall, et al. "E-Cigarette Use and Risk of Cardiovascular Disease: A Longitudinal Analysis of the PATH Study (2013-2019)." Circulation 145, no. 20 (2022): 1557-1559.

6. Olmedo, Pablo, Walter Goessler, Stefan Tanda, et al. "Metal Concentrations in E-Cigarette Liquid and Aerosol Samples: The Contribution of Metallic Coils." Environmental Health Perspectives 126, no. 2 (2018): 027010.

7. Pinkston, Rebecca, Bilal Khan, Ji Hong, and Hao Chen. "Elevated Toxic Element Emissions from Popular Disposable E-Cigarettes: Sources, Life Cycle, and Health Risks." ACS Central Science (2025).

8. Centers for Disease Control and Prevention. "Outbreak of Lung Injury Associated with the Use of E-Cigarette, or Vaping, Products." Morbidity and Mortality Weekly Report (2020).

9. Blount, Benjamin C., Mateusz P. Karwowski, Peter G. Shields, et al. "Vitamin E Acetate in Bronchoalveolar-Lavage Fluid Associated with EVALI." New England Journal of Medicine 382, no. 8 (2020): 697-705.

10. U.S. Department of Health and Human Services. "E-Cigarette Use Among Youth and Young Adults: A Report of the Surgeon General." Atlanta: Centers for Disease Control and Prevention, 2016, with subsequent advisories through 2025.

11. Mohammadi, Lisa, Adam Khan, Edmund Heng, et al. "Chronic E-Cigarette Use Impairs Endothelial Function on the Physiological and Cellular Levels." Arteriosclerosis, Thrombosis, and Vascular Biology 42, no. 11 (2022): 1333-1350.

Published on damianrasch.com. The above information was composed by Dr. Damian Rasch, drawing on individual insight and bolstered by digital research and writing assistance. The information is for educational purposes only and does not constitute medical advice.