If you smoke, you may wonder if switching to a vape is a healthier choice. The short answer is yes. For adults who already smoke, completely switching from cigarettes to vaping is generally less harmful than continuing to smoke.

But that does not mean vaping is safe. Vaping is also much newer than smoking. We have decades of research showing how smoking harms the body, but we do not yet know the full long-term effects of vaping.

1. Smoking Is Extremely Harmful

Cigarettes burn tobacco. When tobacco burns, it creates smoke that contains more than 7,000 chemicals. At least 69 of these chemicals can cause cancer. You breathe these chemicals deep into your lungs every time you smoke.

Smoking can damage almost every part of the body. It is a major cause of lung cancer, chronic obstructive pulmonary disease (COPD), heart disease, and stroke. Smoking and secondhand smoke cause more than 480,000 deaths in the United States each year. 

The Problem Is More Than Nicotine

Nicotine is what makes cigarettes addictive, but it is not the main reason smoking causes so much disease. Much of the serious harm comes from the smoke created when tobacco burns.

Cigarette smoke contains carbon monoxide, tar, and many toxic chemicals that can damage the lungs, blood vessels, and other organs. This is one of the biggest differences between smoking and vaping. Vaping does not burn tobacco, so it usually exposes users to much lower levels of many of these harmful chemicals.

2. What Is Vaping and What Is in Vape Aerosol?

E-cigarettes use a battery to heat a liquid and create an aerosol that you breathe into your lungs. People often call this “vapor,” but it is not simply harmless water vapor.

Most e-cigarettes contain nicotine, which is highly addictive. The aerosol can also contain flavoring chemicals, tiny particles, volatile organic compounds, and metals such as nickel, tin, and lead. Some of these substances can irritate or harm the lungs and other parts of the body.

The contents are not the same in every vape. Different devices, liquids, flavors, nicotine levels, and heating temperatures can change what the user breathes in. This is another reason it is difficult to give one simple answer about the risks of every vaping product.

3. Why Vaping May Be Less Harmful Than Smoking

The biggest difference between smoking and vaping is what happens to the tobacco. A cigarette burns tobacco at very high temperatures. This burning creates smoke filled with thousands of harmful chemicals.

A vape does not burn tobacco. It heats a liquid to make an aerosol. Because there is no burning tobacco, vaping usually exposes the body to much lower levels of many toxic chemicals found in cigarette smoke. This does not make vaping harmless, but it helps explain why vaping is generally less harmful than smoking.

What the Research Shows

Research has found much lower exposure to many toxic substances in people who vape than in people who smoke. For example, a large 2022 evidence review found that levels of a marker linked to acrolein exposure were about 71% lower in vapers than smokers. A marker linked to acrylonitrile was about 94% lower, and one linked to 1,3-butadiene was about 83% lower. Exposure to several tobacco-specific cancer-causing chemicals was also much lower.

Carbon monoxide exposure is also much lower with vaping because carbon monoxide is mainly produced when tobacco burns. In people who completely switch from cigarettes to vaping, some studies found carbon monoxide levels close to those seen in people who do not smoke.

These numbers show that vaping can greatly reduce exposure to many harmful chemicals. They do not mean vaping is “83%,” “94%,” or “71%” safer overall. Health risks come from many different substances and can change with the product and how it is used.

What About the “95% Safer” Claim?

The “95% safer” figure came from a 2015 expert review in England. The estimate was meant to show the large difference between smoking and vaping. It was not based on tracking thousands of people for decades and counting how many developed cancer, heart disease, or other diseases.

Later evidence reviews said the figure could still help explain the large difference in risk, but also warned that it can be too simple. The 2022 review said it may be better to say that vaping causes only a small fraction of the risks of smoking.

We still do not have enough long-term evidence to give an exact number for how much vaping changes a person’s lifetime risk of disease or death. So, it is safer to think of vaping as less harmful than smoking, not 95% safe.

4. Is Vaping Safe?

No. Vaping is not safe.

Vaping still exposes your lungs and body to nicotine and other substances that may cause harm. Studies have linked vaping with breathing problems, airway irritation, inflammation, and changes in blood vessel function. The effects can also vary based on the device, liquid, nicotine level, and how often a person vapes.

At the same time, the risks of vaping are not the same as the risks of smoking. The strongest evidence shows that vaping exposes people to fewer toxic chemicals than cigarette smoking. But researchers still do not know what years or decades of vaping may do to the body.

This is the key point: less harmful does not mean harmless. For an adult who already smokes, switching completely to vaping can lower exposure to many dangerous chemicals. For someone who does not smoke, starting to vape adds health risks without the major benefit of moving away from cigarettes.

5. How Does Vaping Affect Your Lungs and Heart?

Your Lungs

Vaping can irritate the airways and may cause symptoms such as coughing, wheezing, and shortness of breath. A recent review looked at 119 studies on vaping and breathing health. It found that people who vape but have never smoked had a higher risk of breathing symptoms than people who had never smoked or vaped. However, they had about 25% lower risk of respiratory symptoms than people who currently smoked cigarettes.

This fits with what we know about the difference between smoking and vaping. Vaping appears to be less harmful to the lungs than smoking, but it is not harmless to the lungs.

Researchers are still studying whether long-term vaping can cause COPD or lung cancer. There is not yet enough long-term human evidence to give a clear answer.

Your Heart

Nicotine can raise heart rate and blood pressure for a short time. Vaping can also affect blood vessels and how well they work. A 2024 review of clinical trials found that nicotine-containing e-cigarettes raised heart rate and blood pressure compared with nicotine-free e-cigarettes. The same review found smaller short-term effects than traditional cigarettes in some measures.

Smoking has a much stronger and longer track record of causing heart disease and stroke. Vaping appears to have fewer cardiovascular risks than smoking, but it is still too early to know the full long-term effects. Current research shows that vaping can affect the heart and blood vessels, so it should not be viewed as a risk-free choice.

6. Can Vaping Cause Cancer?

Smoking is a proven cause of many cancers, including lung, mouth, throat, bladder, and pancreatic cancer. Much of this risk comes from the many toxic chemicals created when tobacco burns.

Vape aerosol can also contain chemicals that may cause cancer. Research has found signs of oxidative stress, DNA damage, and other changes in cells exposed to e-cigarette aerosols. A recent review found strong evidence of these changes in laboratory and biomarker studies.

But there is an important limit to what we know. Vaping has not been around long enough for researchers to follow large groups of people for several decades and measure their lifetime cancer risk. So, we cannot yet give a reliable number for how much vaping increases cancer risk.

The best evidence suggests that vaping is likely to have a lower cancer risk than smoking because it produces far fewer of many cancer-causing chemicals. But lower risk does not mean zero risk.

7. Nicotine, Young People, and Pregnancy

Why Nicotine Is a Problem

Nicotine is highly addictive. Regular use can lead to dependence, which can make it hard to stop vaping even when someone wants to quit.

Some newer vapes can also deliver high amounts of nicotine. This can make it easy to use nicotine often throughout the day. The amount you receive depends on the device, liquid, nicotine strength, and how you vape.

Young People

Nicotine is especially concerning for children and teenagers because the brain is still developing. Nicotine can affect areas of the brain involved in attention, learning, mood, and self-control.

Vaping remains a major concern among young people. In the 2025 U.S. National Youth Tobacco Survey, about 1.44 million middle and high school students reported current e-cigarette use. That included 7.1% of high school students and 2.6% of middle school students. More than 1 in 4 current youth users reported vaping every day, and 89.4% used flavored e-cigarettes.

Flavors, social media, colorful products, and small devices that are easy to hide can make vaping more appealing to young people. These factors make youth vaping an important public-health concern.

Pregnancy

Nicotine can harm a baby’s developing brain and lungs. Because of this, vaping is not considered safe during pregnancy.

If you are pregnant and smoke, talk with your doctor or another qualified health professional about the safest way to quit. Stopping cigarette smoking is very important for both you and your baby, and you do not have to figure out the best way to quit on your own.

8. What About Dual Use?

Dual use means smoking cigarettes and vaping at the same time. Some people switch between the two because they are trying to cut down on smoking.

The problem is that vaping while continuing to smoke does not give the same health benefit as switching completely. If you keep smoking cigarettes, you keep breathing in the toxic chemicals created by burning tobacco.

Research also suggests that dual users can have toxicant exposure closer to that of smokers than people who vape only. This is why the goal should be to stop smoking completely rather than simply add vaping to your smoking routine.

If you cannot quit cigarettes right away, switching completely to vaping may still reduce your exposure to many harmful chemicals. But the best long-term goal is to move away from both cigarettes and vaping.

9. Can Vaping Help You Quit Smoking?

The evidence on vaping as a way to quit smoking has changed as more research has become available. Earlier studies were less clear, but newer research gives us a better picture.

A 2026 Cochrane review looked at 90 completed studies with more than 29,000 people. It included 49 randomized trials. The review found that nicotine e-cigarettes helped more people stop smoking for at least six months than nicotine replacement therapy, such as patches or gum. About 8 to 10 out of every 100 people using nicotine e-cigarettes stopped smoking, compared with about 6 out of 100 using nicotine replacement therapy and about 5 out of 100 receiving no medicine or behavioral support alone.

This means nicotine e-cigarettes can help some adults quit smoking. Other proven options include nicotine patches, gum, lozenges, prescription medicines, and counseling or other behavioral support. The best choice depends on the person, and some people benefit from using more than one type of support.

But helping someone quit smoking does not make vaping harmless. Vaping still exposes the body to nicotine and other substances. For an adult smoker, the goal is to move away from cigarettes and, when possible, eventually stop vaping too.

10. What Happens When You Completely Switch From Cigarettes to Vaping?

There is an important difference between cutting down on cigarettes and stopping them completely. Smoking fewer cigarettes may reduce some exposure, but even a small amount of smoking can still expose you to harmful chemicals.

When a person completely stops smoking and switches to vaping, exposure to many toxic chemicals drops sharply. Carbon monoxide exposure also falls because carbon monoxide is mainly produced when tobacco burns. This is one reason a complete switch can reduce harm compared with continuing to smoke.

However, switching does not remove all exposure. The person is still taking in nicotine and other chemicals from the vape aerosol. So, completely switching to vaping is best viewed as a harm-reduction step, not as a healthy habit.

If you smoke, stopping cigarettes completely is the most important step. If vaping helps you do that, it may be a better option than continuing to smoke.

11. Other Risks of Vaping

Secondhand Exposure

The aerosol from a vape is different from cigarette smoke, but it is not harmless. People nearby can be exposed to nicotine, tiny particles, and other chemicals released into the air.

We still do not know the full long-term effects of secondhand vape aerosol. For this reason, it is best not to vape around children, pregnant people, or anyone who does not choose to be exposed.

E-Liquid Poisoning

Nicotine liquid can be dangerous if it is swallowed or gets on the skin or in the eyes. This is especially important for young children, who can become seriously ill from a small amount of concentrated nicotine liquid.

Keep vape liquids in their original containers and store them where children cannot see or reach them. Never leave an open bottle or filled vape where a child could pick it up.

Vaping-Related Lung Injury

In 2019, the United States saw a large outbreak of serious lung injuries linked to vaping products. By February 2020, there were 2,807 reported hospitalized cases or deaths and 68 confirmed deaths.

The outbreak was strongly linked to THC-containing vaping products, especially products obtained from informal sources. Vitamin E acetate was also strongly linked to the outbreak.

This event showed that some vaping products can cause severe lung injury. However, it should not be used to claim that nicotine vaping and cigarette smoking have the same risks. The evidence shows that the 2019 outbreak had a strong connection to certain THC products and vitamin E acetate.

Conclusion

So if you do not smoke, you should not start vaping. If you smoke, quitting completely is the best choice. If you cannot quit right away, completely switching away from cigarettes may reduce harm compared with continuing to smoke.