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|Nicotine doesn't cause cancer. There are at
least 4,000 chemicals in tobacco smoke, 43 of which have been proven to cause cancer.
Nicotine is not one of them. Nicotine replacement as gum or patch is safe and effective.
Nicotine isn't always addictive. Smoking nicotine is addictive because it is delivered so quickly to your brain. Nicotine from cigarette smoke enters the body through the lungs, "upstream" from the brain, and travels directly to the brain in just 7-10 seconds via the arteries. In contrast, nicotine in a patch enters the body through the skin, slowly, "downstream" from the brain, and is diluted and broken down by the liver before eventually reaching the brain. Patches aren't addictive.
"Light" cigarettes are just as harmful as regular ones. "Light" cigarettes have tiny holes just where your fingers hold them. Why? When you inhale, you get full-strength smoke. But when just the end of the filter is inserted into a "smoking machine" to determine the tar, nicotine, and carbon monoxide content, the smoke is diluted by air entering through those holes. What's more, people inhale deeper and more frequently after switching from "regular" to "light" cigarettes, in order to keep the same average level of nicotine in their bloodstream.
1 in 2 smokers will die from their habit. (and for every smoker who dies of lung cancer, 5 will die from some other disease) True or false? 20% of all deaths in North America are caused by cigarette smoking. One in two smokers will die from their habit, losing an average of 15 years of life. One third of all deaths in middle age (ages 35-69) are caused by cigarettes. Incredible, but: True. True. True.
Smoking doesn't cause just lung cancer. It contributes to back pain, osteoporosis (thinning of the bones), and male impotence. It affects the circulation, "hardening the arteries", and also creates low-level carbon monoxide poisoning. Together, these decrease the delivery of oxygen to every part of the body including discs in the spine. Smokers have more back pain than non-smokers, and heal slower.
Second-hand smoke causes many diseases in children, including ear infections, asthma, bronchitis, pneumonia, and SIDS (sudden infant death syndrome). Smoke in an infant's household quadruples the chances of a SIDS death (sudden infant death syndrome). Each year in the United States second-hand smoke causes an estimated 284 to 364 deaths in children from house fires and lung infections. Also, it causes between 354,000 and 2.2 million ear infections in children, as well as 260,000 to 436,000 episodes of bronchitis and 115,000 to 190,000 episodes of pneumonia. A non-smoking spouse of a regular smoker has a 20% increase in their chances of developing lung cancer, and a 30% increase in their chance of developing heart disease.
The actual benefits of quitting. A 42-year old male smoking 20 or more cigarettes a day has about a 1 in 5 chance of dying within 17 years. If they quit, that risk is reduced to 1 in 10.
Cravings may not be due to nicotine withdrawal. Nicotine withdrawal is a physical affliction which lasts for two or three weeks. Beyond that period, "cravings" are entirely based on psychological factors: exposure to common "triggers" to smoking, and lack of alternative ways of coping with stressful situations.
There are as many ex-smokers alive as there are smokers. In Canada --and the United States is very similar-- 47% of the people who have ever smoked and are still alive haven't smoked in the past six months. That means that for every smoker, there's an ex-smoker.
A definition of nicotine dependence
Mayo Clinic Health EducationYou may be dependent on nicotine if you have used tobacco for at least one month and experience one or more of the following characteristics:
In all these criteria, the central element of addiction is that the substance controls your behaviour by producing temporary alterations in your mood when it is not in your system.Smoking of Tobacco
The smoking of tobacco, in cigarettes, cigars, or a pipe, is a habit that meets many of the criteria that define an addiction. For some smokers, it provides a relief from anxiety and tension; but for others, it becomes a physical and psychological burden. Cigar and pipe smoking, although they present some hazards to health, are thought to be less dangerous to health than cigarette smoking.
Cigarette smoking damages the lungs, blood vessels, and, to a lesser extent, other organs, such as the heart.
Cancer of the lung is a serious health hazard; the peak of its incidence in men occurs in the 55 to 65 age group (when 1 in 7 deaths results from lung cancer). Approximately 2 out of every 5 heavy smokers die before the age of 65. In women who smoke, the highest mortality rate occurs 10 years earlier than in men, and 1 death in 3 caused by lung cancer will be that of a woman.
People who smoke not only damage their own health, but also harm others. For instance, a pregnant woman who smokes harms her unborn child; children exposed to smoke have more respiratory illnesses; a person who suffers from heart disease may be adversely affected by other persons' smoke; and people who live or work in smoky environments have an increased risk of developing respiratory ailments. In the last several years, many governmental agencies and private companies have instituted policies that limit or ban smoking in public areas.
Although the sale of cigarettes to persons below the age of 18 is not allowed in the United States and other countries, tobacco remains one of the most easily obtained addictive drugs.
Q: What are the harmful substances in tobacco and what do they do?
A: There are four main groups of dangerous substances in tobacco smoke. Nicotine is the substance that causes addiction. It stimulates the release of epinephrine and other substances in the body that cause an increase in pulse rate, a rise in blood pressure, and a narrowing of the blood vessels in the skin. Epinephrine also causes an increase in fatty substances in the blood and makes blood platelets (factors in blood clotting) stickier and therefore more likely to form blood clots.
Carbon monoxide is a poisonous gas produced by the incomplete burning of tobacco. In the lungs, it combines with hemoglobin in the blood and thus prevents the hemoglobin from carrying its full quota of oxygen throughout the circulation. It reduces a person's physical fitness and also acts as a poison.
Various substances in tobacco irritate the lining of the bronchi, inducing spasm and increasing bronchial secretions. At the same time, these irritants damage cells that usually sweep the secretions out of the lungs. This increases the likelihood of developing bronchitis.
Cancer-producing substances are present in the tar in cigarette smoke.
Q: Is there any way of reducing the dangers of cigarette smoking?
A: Yes. Obviously, the best way of avoiding the dangers of cigarette smoking is to give up the habit. Cigarettes, preferably with filters, should be smoked to a long stub, not a short one. Removing the cigarette from the mouth between puffs helps reduce the amount of smoke that is inhaled. Nicotine chewing gum is of moderate value as an adjunct to behavioural or psychological therapy for physically dependent smokers who wish to quit entirely. Recently transdermal continuous low-level nicotine systems have become available, allowing a replacement of part of the nicotine level obtained by smoking. These nicotine patches have been more effective than the gum. The patches are contraindicated in non-smokers, pregnant women, and patients with a recent heart attack, life-threatening heart rhythm disturbances, or unstable angina.
Q: What effect does smoking during pregnancy have on the foetus?
A: Babies born to mothers who smoke are 5 to 13 ounces (140 to 364 g) lighter on average than those born to nonsmoking mothers. Also, pregnant women who smoke are more likely to have a miscarriage, stillborn baby, or infant that dies soon after birth. Twice as many premature babies are born to smoking mothers as to nonsmoking mothers. Evidence also suggests that by the age of 11 the children of mothers who smoked more than 10 cigarettes a day during pregnancy are slightly shorter and slightly below average in reading, math, and general ability than children of non-smoking mothers.
Q: What are the effects of smoking on the lungs?
A: Chronic bronchitis and, eventually, emphysema commonly occur in heavy smokers, and a morning cough is a common feature of all smokers. Early lung damage can be detected by pulmonary function tests before there is any obvious shortness of breath.
Among persons who smoke a pack of cigarettes a day, lung cancer occurs 20 times more frequently than in non-smokers. The risk is increased in those who smoke high-tar cigarettes, who inhale deeply, and who began smoking in adolescence.
Q: Can smoking cause other cancers?
A: Yes. There are more cancers of the bladder and pancreas in smokers than in non-smokers. Cancer of the mouth, tongue, larynx, and esophagus are also more common in smokers of all kinds of tobacco.
Q: Can smoking affect the heart?
A: Cigarette smoking increases the likelihood of arteriosclerosis and doubles the risk of coronary thrombosis. The risk of developing other blood vessel disorders is also increased.
Q: What other diseases are more likely to occur in smokers?
A: Dental and gum disorders occur more commonly in smokers. Smokers are also more likely to develop tuberculosis, probably because the damaging effect of the irritants in tobacco lowers the resistance of the lungs to this type of infection.
Although smoking does not cause peptic ulcers, the continued habit prevents them from healing. Consequently, complications are more common and mortality is greater from perforated ulcers.
Q: What are the benefits of stopping smoking?
A: Within a few days or weeks, there is an improvement in the sense of taste and smell, a gradual reduction in the amount of morning coughing, and less shortness of breath during exercise. There is often a temporary increase in phlegm production.
Although lung damage, such as that caused by chronic bronchitis and emphysema, cannot be reversed once it has occurred, its progress is arrested.
However, the greatest long-term benefit is the steady decrease in the chances of getting cancer. If a person who stops smoking cigarettes lives for 10 years, his or her chance of developing lung cancer is no more than for someone who has never smoked.
Smoking and Your Digestive SystemFrom the National Institute of Diabetes and Digestive and Kidney Diseases
Cigarette smoking causes a variety of life-threatening diseases, including lung cancer, emphysema, and heart disease. An estimated 400,000 deaths each year are caused directly by cigarette smoking. Smoking is responsible for changes in all parts of the body, including the digestive system. This fact can have serious consequences because it is the digestive system that converts foods into the nutrients the body needs to live. Current estimates indicate that about one-third of all adults smoke. And, while adult men seem to be smoking less, women and teenagers of both sexes seem to be smoking more. How does smoking affect the digestive system of all these people?
Smoking has been shown to have harmful effects on all parts of
the digestive system, contributing to such common disorders as heartburn and peptic
ulcers. It also increases the risk of Crohn's disease and
possibly gallstones. Smoking seems to affect the liver, too, by
changing the way it handles drugs and alcohol. In fact, there
seems to be enough evidence to stop smoking solely on the basis
of digestive distress. These everyday disorders are similar to
mesothelioma symptoms, a type of cancer that affects the membrane lining of
the abdomen and lungs.
Heartburn is common among Americans. More than 60 million Americans have heartburn at least once a month, and about 15 million have it daily.
Heartburn happens when acidic juices from the stomach splash into the esophagus. Normally, a muscular valve at the lower end of the esophagus, the lower esophageal sphincter (LES), keeps the acid solution in the stomach and out of the esophagus. Smoking decreases the strength of the esophageal valve, thereby allowing stomach juice to reflux, or flow backward into the esophagus.
Smoking also seems to promote the movement of bile salts from the intestine to the stomach, which makes the stomach juice more harmful. Finally, smoking may directly injure the esophagus, making it less able to resist further damage from refluxed material.
Peptic UlcerA peptic ulcer is an open sore in the lining of the stomach or duodenum, the first part of the small intestine. The exact cause of ulcers is not known. A relationship between smoking cigarettes and ulcers, especially duodenal ulcers, does exist. The 1989 Surgeon General's report stated that ulcers are more likely to occur, less likely to heal, and more likely to cause death in smokers than in non-smokers.
Why is this so? Doctors are not really sure, but smoking does seem to be one of several factors that work together to promote the formation of ulcers.
For example, some research suggests that smoking might increase a person's risk of infection with the bacterium Helicobacter pylori (H. pylori). Most peptic ulcers are caused by this bacterium.
Stomach acid is also important in producing ulcers. Normally, most of this acid is buffered by the food we eat. Most of the un-buffered acid that enters the duodenum is quickly neutralized by sodium bicarbonate, a naturally occurring alkali produced by the pancreas. Some studies show that smoking reduces the bicarbonate produced by the pancreas, interfering with the neutralization of acid in the duodenum. Other studies suggest that chronic cigarette smoking may increase the amount of acid secreted by the stomach. Whatever causes the link between smoking and ulcers, two points have been repeatedly demonstrated: People who smoke are more likely to develop an ulcer, especially a duodenal ulcer, and ulcers are less likely to heal quickly among smokers in response to otherwise effective treatment. This research tracing the relationship between smoking and ulcers strongly suggests that a person with an ulcer should stop smoking.
The liver is an important organ that has many tasks. Among other things, the liver is responsible for processing drugs, alcohol, and other toxins to remove them from the body. There is evidence that smoking alters the ability of the liver to handle these substances. In some cases, this may influence the dose of medication necessary to treat an illness. Some research also suggests that smoking can aggravate the course of liver disease caused by excessive alcohol intake.
Crohn's disease causes inflammation deep in the lining of the intestine. The disease, which causes pain and diarrhea, usually affects the small intestine, but it can occur anywhere in the digestive tract. Research shows that current and former smokers have a higher risk of developing Crohn's disease than non-smokers do. Among people with the disease, smoking is associated with a higher rate of relapse, repeat surgery, and immunosuppressive treatment. In all areas, the risk for women, whether current or former smokers, is slightly higher than for men. Why smoking increases the risk of Crohn's disease is unknown, but some theories suggest that smoking might lower the intestine's defences, decrease blood flow to the intestines, or cause immune system changes that result in inflammation.
Several studies suggest that smoking may increase the risk of developing gallstones and that the risk may be higher for women. However, research results on this topic are not consistent, and more study is needed.
Can the Damage Be Reversed?
Some of the effects of smoking on the digestive system appear to be of short duration. For example, the effect of smoking on bicarbonate production by the pancreas does not appear to last. Within a half-hour after smoking, the production of bicarbonate returns to normal. The effects of smoking on how the liver handles drugs also disappear when a person stops smoking. However, people who no longer smoke still remain at risk for Crohn's disease. Clearly, this question needs more study.
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Updated February 2019