ConditionHeart & circulation
Heart Disease in Nonsmokers
Heart disease in nonsmokers is common: most people who have a heart attack have never smoked, or quit years ago. Not smoking lowers risk a great deal, but high blood pressure, high LDL cholesterol, diabetes, excess weight, inactivity and family history still drive the artery-clogging process called atherosclerosis. Less obvious factors include an inherited particle called lipoprotein(a), secondhand smoke, air pollution, sleep apnea, autoimmune disease and pregnancy complications. Most of these can be tested for and treated.
Also called: Cardiovascular disease in nonsmokers, heart disease in never-smokers, coronary artery disease without smoking
At a glance
- The point
- Not smoking removes one major risk, but most heart attacks happen in nonsmokers or former smokers.
- Main drivers
- High blood pressure, high LDL cholesterol, diabetes, obesity, physical inactivity, age and family history.
- Often overlooked
- Lipoprotein(a), secondhand smoke, air pollution, sleep apnea, kidney disease, inflammatory diseases and pregnancy complications.
- How it is assessed
- Blood pressure, cholesterol and blood sugar tests, a 10-year risk score and sometimes a coronary calcium scan.
- Prevention
- Control blood pressure, cholesterol and sugar, stay active, keep a healthy weight, sleep well.
When to get help
Call 911 or go to the ER
- Chest pressure, squeezing or pain lasting more than a few minutes, or spreading to the arm, jaw, neck or back: call 911 or your local emergency number
- Sudden shortness of breath, cold sweat, nausea or lightheadedness, especially in women and people with diabetes, even without chest pain
- Sudden weakness or numbness on one side of the face or body, or trouble speaking
See a doctor within a day or two
- Chest discomfort or breathlessness that comes on with exertion and settles with rest
- New palpitations with dizziness or fainting
Book a routine appointment
- No blood pressure or cholesterol check in the past few years
- A parent or sibling with a heart attack or stroke before age 55 (men) or 65 (women)
- A history of preeclampsia, gestational diabetes or early menopause
- Loud snoring with pauses in breathing and daytime sleepiness
Usually safe to manage at home
- Building daily activity, a Mediterranean-style eating pattern and good sleep habits to lower risk
Why nonsmokers still get heart disease
Coronary artery disease, the most common form of heart disease, develops when fatty plaque builds up in the arteries that supply the heart. Smoking accelerates this, but plaque forms without smoking whenever cholesterol particles get into the artery wall and inflammation follows. The longer the arteries are exposed to high LDL cholesterol, high blood pressure and high blood sugar, the more plaque builds up.
Because about 9 in 10 US adults do not smoke, the absolute number of heart attacks in nonsmokers is large. Nonsmokers also tend to develop disease later in life, so age itself becomes a major factor.
The main risk factors
Blood pressure
High blood pressure strains and damages artery walls and is the single largest contributor to heart disease and stroke worldwide. It usually causes no symptoms. A reading of 130/80 mm Hg or higher is classed as high in US guidelines.
LDL cholesterol
LDL ("bad") cholesterol is the raw material of plaque. Risk rises steadily with higher LDL and with longer exposure. Many nonsmokers with heart disease have had moderately high LDL for decades without knowing it. See high cholesterol.
Diabetes and insulin resistance
Type 2 diabetes roughly doubles the risk of heart disease. Prediabetes, belly fat, high triglycerides and low HDL (metabolic syndrome) also add risk.
Weight, activity and diet
Excess weight, sitting most of the day, and diets high in processed meat, salt, sugar-sweetened drinks and refined carbohydrates all raise blood pressure, cholesterol and blood sugar.
Age, sex and family history
Risk rises with age. Men tend to develop heart disease about 7 to 10 years earlier than women. A father or brother with heart disease before 55, or a mother or sister before 65, signals higher inherited risk.
Less obvious risk factors
| Risk factor | Why it matters | What you can do |
|---|---|---|
| Lipoprotein(a), or Lp(a) | An inherited cholesterol particle that promotes plaque and clots. About 1 in 5 people have high levels, regardless of lifestyle | A one-time blood test. If high, control other risks more tightly |
| Familial hypercholesterolemia | Inherited very high LDL from birth | LDL above about 190 mg/dL needs specialist treatment and family testing |
| Secondhand smoke | CDC estimates it raises heart disease risk by 25% to 30% in nonsmokers | Keep homes and cars smoke-free, including from vaping |
| Air pollution | Fine particles inflame arteries and trigger heart attacks | Check air quality alerts and limit outdoor exertion on bad days |
| Sleep apnea | Repeated oxygen drops raise blood pressure and cause arrhythmias | Get tested if you snore and are sleepy in the day |
| Chronic kidney disease | Strongly increases heart risk | Regular kidney blood and urine tests if you have diabetes or high blood pressure |
| Inflammatory diseases | Rheumatoid arthritis, lupus, psoriasis and HIV accelerate atherosclerosis | Keep the disease controlled and get risk factors checked |
| Pregnancy complications | Preeclampsia, gestational diabetes and preterm birth signal future risk | Tell your doctor; get yearly checks |
| Early menopause | Menopause before 40 increases risk | Discuss risk assessment with your doctor |
| Heavy drinking | Raises blood pressure and causes heart muscle damage and arrhythmias | Keep alcohol low |
| Chronic stress, depression, poor sleep | Linked to higher blood pressure and heart events | Treat depression; aim for 7 to 9 hours of sleep |
| Cancer treatment | Some chemotherapy and chest radiation damage the heart | Long-term heart monitoring as advised |
Heart attacks without plaque
Some heart attacks in nonsmokers, particularly younger women, are not caused by plaque. Spontaneous coronary artery dissection (SCAD), a tear in an artery wall, is a leading cause of heart attack in women under 50 and around pregnancy. Coronary artery spasm and blood clots from other conditions are other causes.
Symptoms to know
Heart disease often causes no symptoms until a heart attack. Warning signs include:
- chest pain, pressure or tightness, especially with exertion
- shortness of breath out of proportion to activity
- discomfort in the arm, jaw, neck, back or upper stomach
- unusual fatigue, nausea or cold sweats
Women, older adults and people with diabetes more often have these "atypical" symptoms without classic chest pain.
How your risk is checked
- Blood pressure at every visit, and home monitoring if borderline.
- Lipid panel (cholesterol), plus Lp(a) at least once in adulthood, as recommended by several cardiology societies.
- HbA1c or fasting glucose for diabetes.
- Kidney tests.
- A 10-year risk calculator: the American Heart Association's PREVENT equations estimate your chance of heart attack, stroke and heart failure.
- Coronary artery calcium (CAC) scan: a low-dose CT scan that measures calcified plaque. It helps decide on statin treatment when risk is borderline or intermediate. A score of zero means low short-term risk.
Lowering your risk
The American Heart Association's Life's Essential 8 lists the measures that matter most:
- Eat a pattern rich in vegetables, fruit, whole grains, legumes, nuts, fish and olive oil (such as the Mediterranean or DASH diet).
- Get at least 150 minutes of moderate activity a week.
- Avoid all nicotine, including vaping and secondhand smoke.
- Sleep 7 to 9 hours a night.
- Keep a healthy weight.
- Control cholesterol.
- Control blood sugar.
- Control blood pressure.
When lifestyle changes are not enough, medicines such as statins, other cholesterol-lowering drugs, blood pressure medicines and some diabetes medicines (GLP-1 receptor agonists and SGLT2 inhibitors) lower heart risk substantially. Daily aspirin is no longer recommended for most people without existing heart disease because of bleeding risk. Ask your doctor before starting or stopping it.
Frequently asked questions
Can you get heart disease if you don't smoke?
Yes. Most people who develop heart disease have never smoked or quit long ago. High blood pressure, high LDL cholesterol, diabetes, obesity, inactivity, age and family history all cause atherosclerosis on their own. Not smoking lowers risk substantially but does not remove it.
Why would a healthy nonsmoker have a heart attack?
Common hidden reasons include high Lp(a) or inherited high cholesterol, undiagnosed high blood pressure, prediabetes, sleep apnea, autoimmune disease or a strong family history. In younger women, a coronary artery tear (SCAD) is an important cause. Sometimes no single cause is found and age plays the main role.
Does secondhand smoke cause heart disease?
Yes. According to the CDC, breathing secondhand smoke raises a nonsmoker's risk of coronary heart disease by about 25% to 30%. Even brief exposure makes blood platelets stickier and damages the lining of blood vessels. There is no safe level of exposure.
What is lipoprotein(a) and should I get tested?
Lipoprotein(a), or Lp(a), is an inherited cholesterol-carrying particle that raises the risk of heart attack, stroke and aortic valve disease. Diet and exercise barely change it. A single blood test is enough for most people, and testing is especially useful if you have early heart disease in your family.
What is the biggest risk factor for heart disease in nonsmokers?
High blood pressure and high LDL cholesterol are the largest modifiable contributors in most people, followed by diabetes and obesity. Age and family history also matter but cannot be changed. Regular checks are the only way to know your numbers, because none of these cause symptoms early on.
Sources
This guide was written from current patient and clinical guidance, including:
- American Heart Association: Life's Essential 8
- American College of Cardiology and American Heart Association: Guideline on the Primary Prevention of Cardiovascular Disease
- CDC: Heart disease risk factors
- CDC: Health effects of secondhand smoke
- National Heart, Lung, and Blood Institute: Coronary heart disease, causes and risk factors