Smoking
What is Smoking?
Smoking involves inhaling tobacco smoke from cigarettes, cigars, or pipes. Tobacco smoke contains over 7,000 chemicals, including at least 70 that cause cancer. These substances damage nearly every organ in your body and create changes you can measure in your blood.
When you smoke, harmful chemicals enter your bloodstream within seconds. Nicotine is the addictive substance that keeps people smoking, but tar, carbon monoxide, and other toxins cause most of the health damage. Over time, smoking increases inflammation throughout your body and changes how your cells function.
Even if you feel fine, smoking creates measurable changes in your blood biomarkers. These changes can appear long before symptoms of disease develop. Testing helps you understand what smoking is doing to your body right now, not just what might happen in the future.
Symptoms
- Persistent cough or smoker's cough
- Shortness of breath during normal activities
- Frequent respiratory infections
- Reduced sense of taste and smell
- Yellow staining on fingers and teeth
- Premature skin aging and wrinkles
- Decreased exercise tolerance
- Increased heart rate even at rest
- Morning phlegm or mucus production
- Poor wound healing
Many people who smoke feel normal for years because damage builds slowly. Your body may adapt to reduced lung function and oxygen levels without obvious symptoms. This is why blood tests matter. They reveal changes happening inside before you notice problems.
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Causes and risk factors
Smoking is a behavior rather than a disease, but it causes widespread changes in your body. Nicotine addiction drives continued smoking once you start. Social factors, stress, mental health conditions, and early exposure all increase smoking risk. Many people start smoking in their teens or early twenties when peer influence is strong.
Genetic factors affect how easily you become addicted to nicotine. Some people find it harder to quit than others because of differences in brain chemistry. Environmental factors like living with smokers or working in high-stress jobs also play a role. Understanding why you smoke helps you develop a personalized plan to quit.
How it's diagnosed
Healthcare providers diagnose smoking through patient history and sometimes measure smoking exposure using blood tests. CEA, or carcinoembryonic antigen, is a protein that rises in smokers even without cancer present. Elevated CEA levels in smokers reflect the inflammatory stress tobacco puts on your body.
Rite Aid offers CEA testing as an add-on to help you understand how smoking affects your biomarkers. Testing at Quest Diagnostics locations makes it easy to get objective data about your health. If your CEA is elevated, your doctor can help you interpret results and create a quit plan. Regular testing after you quit shows how your body recovers over time.
Treatment options
- Nicotine replacement therapy including patches, gum, or lozenges
- Prescription medications like varenicline or bupropion
- Behavioral counseling and quit smoking programs
- Identifying and managing triggers for smoking
- Building a support network of friends and family
- Regular exercise to reduce cravings and stress
- Healthy diet rich in fruits and vegetables
- Stress management techniques like meditation or yoga
- Avoiding alcohol and other smoking triggers
- Setting a specific quit date and making a plan
Need testing for Smoking? Add it to your panel.
- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
Smoking damages nearly every organ system in your body. Chemicals in tobacco smoke cause inflammation, reduce oxygen delivery to tissues, damage blood vessel walls, and interfere with normal cell function. Over time, this damage increases your risk for heart disease, stroke, lung disease, and many types of cancer.
Smoking changes multiple biomarkers in your blood. CEA levels often rise in smokers due to inflammation and tissue stress. Smoking also affects white blood cell counts, cholesterol levels, and markers of inflammation like CRP. These changes can appear even if you feel healthy.
CEA stands for carcinoembryonic antigen, a protein found in certain tissues. Smoking causes inflammation and cell stress that leads to higher CEA levels in your blood. While very high CEA can indicate cancer, moderate elevations in smokers usually reflect the toxic effects of tobacco smoke on your body.
Some biomarkers improve within days to weeks after quitting. CEA levels typically drop within 1 to 3 months as inflammation decreases. Circulation and lung function begin improving within weeks. Long-term markers of heart disease risk continue improving for years after you quit.
Yes, certain biomarkers like CEA are often elevated in smokers. Doctors can also test for cotinine, a nicotine breakdown product, which directly measures recent tobacco exposure. These tests help track smoking status and recovery after quitting.
Combining medication with behavioral support works best for most people. Nicotine replacement therapy or prescription medications double your chances of success. Adding counseling or a quit program increases success rates even more. Having a specific plan and support system makes a big difference.
E-cigarettes and vaping products contain fewer toxic chemicals than traditional cigarettes, but they still deliver nicotine and other harmful substances. Research on how vaping affects biomarkers is still developing. Early evidence suggests vaping may cause less inflammation than smoking, but it is not risk-free.
Annual blood testing helps track how smoking affects your health over time. More frequent testing every 3 to 6 months can be helpful when you are trying to quit. Seeing biomarkers improve after quitting provides motivation and confirms your body is healing.
Healthy lifestyle habits help, but they cannot eliminate the risks of smoking. Exercise and a diet rich in antioxidants may reduce some inflammation, but tobacco smoke still damages your lungs, heart, and blood vessels. The only way to truly reduce smoking-related harm is to quit.
Talk to your doctor about your results. Elevated CEA in smokers is common and usually reflects inflammation from tobacco exposure. Your doctor may recommend additional tests to rule out other causes if your CEA is very high. The most important step is making a plan to quit smoking.