Smoking harms nearly every organ of the body. Some of these harmful effects are immediate. Find out the health effects of smoking and what happens to your body when you quit. Click on a body part icon or title to learn more.
Nicotine from cigarettes is as addictive as heroin. Nicotine addiction is hard to beat because it changes your brain. The brain develops extra nicotine receptors to accommodate the large doses of nicotine from tobacco. When the brain stops getting the nicotine it’s used to, the result is nicotine withdrawal. You may feel anxious, irritable, and have strong cravings for nicotine.
Hearing loss. Smoking reduces the oxygen supply to the cochlea, a snail-shaped organ in the inner ear. This may result in permanent damage to the cochlea and mild to moderate hearing loss.
Blindness and night vision. Smoking causes physical changes in the eyes that can threaten your eyesight. Nicotine from cigarettes restricts the production of a chemical necessary for you to be able to see at night. Also, smoking increases your risk of developing cataracts and macular degeneration (both can lead to blindness).
Cavities. Smoking takes a toll on your mouth. Smokers have more oral health problems than non-smokers, like mouth sores, ulcers and gum disease. You are more likely to have cavities and lose your teeth at a younger age. You are also more likely to get cancers of the mouth and throat.
Smoker’s face. Smoking can cause your skin to be dry and lose elasticity, leading to wrinkles and stretch marks. Your skin tone may become dull and grayish. By your early 30s, wrinkles can begin to appear around your mouth and eyes, adding years to your face.
Smoking raises your blood pressure and puts stress on your heart. Over time, stress on the heart can weaken it, making it less able to pump blood to other parts of your body. Carbon monoxide from inhaled cigarette smoke also contributes to a lack of oxygen, making the heart work even harder. This increases the risk of heart disease, including heart attacks.
Smoking makes your blood thick and sticky. The stickier the blood, the harder your heart must work to move it around your body. Sticky blood is also more likely to form blood clots that block blood flow to your heart, brain, and legs. Over time, thick, sticky blood damages the delicate lining of your blood vessels. This damage can increase your risk for a heart attack or stroke.
Smoking increases the amount of cholesterol and unhealthy fats circulating in the bloods, leading to unhealthy fatty deposits. Over time, cholesterol, fats, and other debris build up on the walls of your arteries. This buildup narrows the arteries and blocks normal blood flow to the heart, brain, and legs. Blocked blood flow to the heart or brain can cause a heart attack or stroke. Blockage in the blood vessels of your legs could result in the amputation of your toes or feet.
Smoking causes inflammation in the small airways and tissues of your lungs. This can make your chest feel tight or cause you to wheeze or feel short of breath. Continued inflammation builds up scar tissue, which leads to physical changes to your lungs and airways that can make breathing hard. Years of lung irritation can give you a chronic cough with mucus.
Smoking destroys the tiny air sacs, or alveoli, in the lungs that allow oxygen exchange. When you smoke, you are damaging some of those air sacs. Alveoli don’t grow back, so when you destroy them, you have permanently destroyed part of your lungs. When enough alveoli are destroyed, the disease emphysema develops. Emphysema causes severe shortness of breath and can lead to death.
Respiratory Infections. Your airways are lined with tiny brush like hairs, called cilia. The cilia sweep out mucus and dirt so your lungs stay clear. Smoking temporarily paralyzes and even kills cilia. This makes you more at risk for infection. Smokers get more colds and respiratory infections than non-smokers.
Your body is made up of cells that contain genetic material, or DNA, that acts as an “instruction manual” for cell growth and function. Every single puff of a cigarette causes damages to your DNA. When DNA is damaged, the “instruction manual” gets messed up, and the cell can begin growing out of control and create a cancer tumor. Your body tries to repair the damage that smoking does to your DNA, but over time, smoking can wear down this repair system and lead to cancer (like lung cancer). One-third of all cancer deaths are caused by tobacco.
Bigger belly. Smokers have bigger bellies and less muscle than non-smokers. They are more likely to develop type 2 diabetes, even if they don’t smoke every day. Smoking also makes it harder to control diabetes once you already have it. Diabetes is a serious disease that can lead to blindness, heart disease, kidney failure, and amputations.
Lower estrogen levels
Smoking lowers a female’s level of estrogen. Low estrogen levels can cause dry skin, thinning hair, and memory problems. Women who smoke have a harder time getting pregnant and having a healthy baby. Smoking can also lead to early menopause, which increases your risk of developing certain diseases (like heart disease).
Failure to launch
Smoking increases the risk of erectile dysfunction—the inability to get or keep and erection. Toxins from cigarette smoke can also damage the genetic material in sperm, which can cause infertility or genetic defects in your children.
High white blood cell count
When you smoke, the number of white blood cells (the cells that defend your body from infections) stays high. This is a sign that your body is under stress—constantly fighting against the inflammation and damage caused by tobacco. A high white blood cell count is like a signal from your body, letting you know you’ve been injured. White blood cell counts that stay elevated for a long time are linked with an increased risk of heart attacks, strokes, and cancer.
Longer to heal
Nutrients, minerals, and oxygen are all supplied to the tissue through the blood stream. Nicotine causes blood vessels to tighten, which decreases levels of nutrients supplied to wounds. As a result, wounds take longer to heal. Slow wound healing increases the risk of infection after an injury or surgery and painful skin ulcers can develop, causing the tissue to slowly die.
Weakened immune system
Cigarette smoke contains high levels of tar and other chemicals, which can make your immune system less effective at fighting off infections. This means you’re more likely to get sick. Continued weakening of the immune system can make you more vulnerable to autoimmune diseases like rheumatoid arthritis and multiple sclerosis. It also decreases your body’s ability to fight off cancer!
Muscle deterioration. When you smoke, less blood and oxygen flow to your muscles, making it harder to build muscle. The lack of oxygen also makes muscles tire more easily. Smokers have more muscle aches and pains than non-smokers.
More Broken Bones
Ingredients in cigarette smoke disrupt the natural cycle of bone health. Your body is less able to form healthy new bone tissue, and it breaks down existing bone tissue more rapidly. Over time, smoking leads to a thinning of bone tissue and loss of bone density. This causes bones to become weak and brittle. Compared to non-smokers, smokers have a higher risk of bone fractures, and their broken bones take longer to heal.
Broken addiction cycle
Quitting smoking can re-wire your brain and help break the cycle of addiction. The large number of nicotine receptors in your brain will return to normal levels after about a month of being quit.
Quitting smoking will keep your hearing sharp. Remember, even mild hearing loss can cause problems (like not hearing directions correctly and doing a task wrong).
Quitting smoking will improve your night vision and help preserve your overall vision by stopping the damage that smoking does to your eyes.
Nobody likes a dirty mouth. After a few days without cigarettes, your smile will be brighter. Quitting smoking now will keep your mouth healthy for years to come.
Quitting smoking is better than anti-aging lotion. Quitting can help clear up blemishes and protect your skin from premature aging and wrinkling.
Decreased heart risks
Smoking is the leading cause of heart attacks and heart disease. But many of these heart risks can be reversed simply by quitting smoking. Quitting can lower your blood pressure and heart rate almost immediately. Your risk of a heart attack declines within 24 hours.
When you quit smoking, your blood will become thinner and less likely to form dangerous blood clots. Your heart will also have less work to do, because it will be able to move the blood around your body more easily.
Quitting smoking will not get rid of the fatty deposits that are already there. But it will lower the levels of cholesterol and fats circulating in your blood, which will help to slow the buildup of new fatty deposits in your arteries.
Stop lung damage
Scarring of the lungs is not reversible. That is why it is important to quit smoking before you do permanent damage to your lungs. Within two weeks of quitting, you might notice it’s easier to walk up the stairs because you may be less short of breath. Don’t wait until later; quit today!
There is no cure for emphysema. But quitting when you are young, before you have done years of damage to the delicate air sacs in your lungs, will help protect you from developing emphysema later.
Return of cilia
Cilia start to re-grow and re-gain normal function very quickly after you quit smoking. They are one of the first things in your body to heal. People sometimes notice that they cough more than usual when they first quit smoking. This is a sign that the cilia are coming back to life. But you’re more likely to fight off colds and infections when you’re cilia are working properly.
Lower cancer risk
Quitting smoking will prevent new DNA damage from happening and can even help repair the damage that has already been done. Quitting smoking immediately is the best way to lower your risk of getting cancer.
Smaller belly. Quitting smoking will reduce your belly fat and lower your risk of diabetes. If you already have diabetes, quitting can help you keep your blood sugar levels in check.
Normal estrogen levels
Normal estrogen levels. If you’re a woman, your estrogen levels will gradually return to normal after you quit smoking. And if you hope to have children someday, quitting smoking right now will increase your chances of a healthy pregnancy in the future.
If you quit smoking now, you can lower your chances of erectile dysfunction and improve your chances of having a healthy sexual life.
Normal white blood cell count
When you quit smoking, your body will begin to heal from the injuries that smoking caused. Eventually, your white blood cell counts will return to normal and will no longer be on the defensive.
Quitting smoking will improve blood flow to wounds, allowing important nutrients, minerals, and oxygen to reach the wound and help it heal properly.
Stronger immune system
Stronger immune system. When you quit smoking, your immune system is no longer exposed to tar and nicotine. It will become stronger, and you will be less likely to get sick.
Quitting smoking will help increase the availability of oxygen in your blood, and your muscles will become stronger and healthier.
Quitting smoking can reduce your risk of fractures, both now and later in life. Keep your bones strong and healthy by quitting now.