How do cigarettes affect the body?
Cigarettes aren’t good for us. That’s hardly news–we’ve known about the dangers of smoking for decades. But how exactly do cigarettes harm us? Let’s look at what happens as their ingredients make their way through our bodies, and how we benefit physically when we finally give up smoking. With each inhalation, smoke brings its more than 5,000 chemical substances into contact with the body’s tissues. From the start, tar, a black, resinous material, begins to coat the teeth and gums, damaging tooth enamel, and eventually causing decay.
- Over time, smoke also damages nerve-endings in the nose, causing loss of smell. Inside the airways and lungs, smoke increases the likelihood of infections, as well as chronic diseases like bronchitis and emphysema. It does this by damaging the cilia, tiny hairlike structures whose job it is to keep the airways clean. It then fills the alveolar, tiny air sacs that enable the exchange of oxygen and carbon dioxide between the lungs and blood.
- A toxic gas called carbon monoxide crosses that membrane into the blood, binding to hemoglobin and displacing the oxygen it would usually have transported around the body. That’s one of the reasons smoking can lead to oxygen deprivation and shortness of breath. Within about 10 seconds, the bloodstream carries a stimulant called nicotine to the brain, triggering the release of dopamine and other neurotransmitters including endorphins that create the pleasurable sensations which make smoking highly addictive. Nicotine and other chemicals from the cigarette simultaneously cause constriction of blood vessels and damage their delicate endothelial lining, restricting blood flow.
- These vascular effects lead to thickening of blood vessel walls and enhance blood platelet stickiness, increasing the likelihood that clots will form and trigger heart attacks and strokes. Many of the chemicals inside cigarettes can trigger dangerous mutations in the body’s DNA that make cancers form. Additionally, ingredients like arsenic and nickel may disrupt the process of DNA repair, thus compromising the body’s ability to fight many cancers. In fact, about one of every three cancer deaths in the United States is caused by smoking. And it’s not just lung cancer.
- Smoking can cause cancer in multiple tissues and organs, as well as damaged eyesight and weakened bones. It makes it harder for women to get pregnant. And in men,it can cause erectile dysfunction. But for those who quit smoking, there’s a huge positive upside with almost immediate and long-lasting physical benefits. Just 20 minutes after a smoker’s final cigarette, their heart rate and blood pressure begin to return to normal. After 12 hours, carbon monoxide levels stabilize, increasing the blood’s oxygen-carrying capacity. A day after ceasing, heart attack risk begins to decrease blood pressure and heart rates normalize. After two days, the nerve endings responsible for smell and taste start to recover.
- Lungs become healthier after about one month, with less coughing and shortness of breath. The delicate hair-like cilia in the airways and lungs start recovering within weeks, and are restored after 9 months, improving resistance to infection. By the one-year anniversary of quitting, heart disease risk plummets to half’s blood vessel function improves. Five years in, the chance of a clot forming dramatically declines, and the risk of stroke continues to reduce. After ten years, the chances of developing fatal lung cancer go down by 50%, probably because the body’s ability to repair DNA is once again restored.
- Fifteen years in, the likelihood of developing coronary heart disease is essentially the same as that of a non-smoker. There’s no point pretending this is all easy to achieve. Quitting can lead to anxiety and depression, resulting from nicotine withdrawal. But fortunately, such effects are usually temporary. And quitting is getting easier,thanks to a growing arsenal of tools. Nicotine replacement therapy through gum, skin patches, lozenges, and sprays may help wean smokers off cigarettes. They work by stimulating nicotine receptors in the brain and thus preventing withdrawal symptoms, without the addition of other harmful chemicals. Counselling and support groups, cognitive behavioral therapy, and moderate intensity exercise also help smokers stay cigarette-free. That’s good news, since quitting puts you and your body on the path back to health.
Will My Lungs Heal from COPD If I Quit Smoking?
Cigarette smoke destroys the walls of the lungs called alveoli, because of that, the oxygen exchange capacity gets diminished. One of the main other functions of alveoli is that it has elastic properties,so it is attached to airways, which are like tubes from all sides. Because of the elastic properties, they pull the tubes in different directions, thereby keeping the tube open all the time. But when they get broken down, there’s nothing pulling the tube in different directions, and so the tube goes narrow, it collapses. So that’s what causes difficulty breathing. Once you stop smoking, and you are on appropriate medications for COPD, your breathing can improve,your exercise capacity can improve, but as far as if the walls have already been destroyed, they cannot be repaired back.
Deaths due to smoking cigarette
- Cigarette smoking is responsible for more than 480,000 deaths per year in the United States, including more than 41,000 deaths resulting from secondhand smoke exposure.
- According to the World Health Organization (WHO), India is home to 12% of the world’s smokers. More than 10 million die each year due to tobacco in India. According to a 2002 WHO estimate, 70% of adult males in India smoke. Among adult females, the figure is much lower at between 13–15%.