2.9 Harmful Effects of Smoking On Heart

Introduction

Smoking is one of the most harmful habits for human health, especially for the heart and blood vessels. Tobacco smoke contains thousands of chemicals, many of which are toxic. These chemicals damage the heart, narrow the blood vessels, and increase the risk of heart disease. This topic explains how smoking harms the heart and why it is important to avoid smoking.

Definition

Smoking is the inhalation of tobacco smoke from cigarettes, cigars, or pipes. Tobacco smoke contains thousands of chemicals, including nicotine, carbon monoxide, and tar, which are harmful to the heart and blood vessels.

Main Idea

Smoking damages the heart and blood vessels. Smoking speeds up the clogging and narrowing of coronary arteries. This can reduce the flow of blood to the heart and increases the risk of heart attack.

Tobacco smoke contains thousands of chemicals, including:

• Nicotine — an addictive drug that affects brain and muscle activity and increases blood pressure, making the heart work harder.
• Carbon monoxide — a poisonous gas that replaces oxygen in the blood, reducing the supply of oxygen to the heart and other organs.

If you smoke, your risk of:

• Heart attack is more than twice as high as someone who does not smoke.
• Stroke is more than twice as high as someone who does not smoke.

Core Concept

Harmful Chemicals in Tobacco Smoke

Detailed Explanation

1. How Smoking Damages the Heart and Blood Vessels

Smoking damages the heart and blood vessels.

What happens:

• Smoking speeds up the clogging and narrowing of coronary arteries.
• This reduces the flow of blood to the heart.
• Reduced blood flow can cause chest pain (angina).
• It increases the risk of heart attack (myocardial infarction).

Simple explanation: Smoking makes the arteries that supply the heart become narrow and blocked. This reduces the blood supply to the heart, which can cause a heart attack.

2. Nicotine

What it is: Nicotine is an addictive drug found in tobacco.

Effect on the heart:

• Affects brain and muscle activity.
• Increases blood pressure.
• Makes the heart work harder.
• Increases heart rate.

Simple explanation: Nicotine makes your heart beat faster and harder. This puts extra stress on the heart.

Why this is dangerous:

• Increased blood pressure and heart rate increase the heart's oxygen demand.
• If the coronary arteries are narrowed, the heart cannot get enough oxygen.
• This can lead to chest pain or heart attack.

3. Carbon Monoxide

What it is: Carbon monoxide is a poisonous gas found in tobacco smoke.

Effect on the heart:

• Replaces oxygen in the blood.
• Reduces the supply of oxygen to the heart and other organs.

Simple explanation: Carbon monoxide takes the place of oxygen in your blood. This means your heart and other organs get less oxygen.

Why this is dangerous:

• The heart needs oxygen to function.
• If the heart does not get enough oxygen, it cannot pump properly.
• This can lead to heart damage and heart attack.

4. Risk of Heart Attack and Stroke

If you smoke, your risk of:

• Heart attack is more than twice as high as someone who does not smoke.
• Stroke is more than twice as high as someone who does not smoke.

Simple explanation: Smokers are more than twice as likely to have a heart attack or stroke compared to non-smokers.

5. Other Harmful Effects of Smoking

Smoking also causes:

• Cancer (lung, mouth, throat, etc.)
• Chronic bronchitis
• Emphysema
• Early morning cough
• Increased risk of pneumonia
• Worsening of asthma and allergies
• Difficulty in breathing

Simple explanation: Smoking not only harms the heart but also damages the lungs and other organs.

Intermediate Level

Smoking harms the heart in several ways:

• Nicotine — increases blood pressure and heart rate.
• Carbon monoxide — replaces oxygen in the blood.

• Speeds up clogging and narrowing of coronary arteries.
• Reduces blood flow to the heart.
• Increases risk of heart attack and stroke.

3. Risk comparison:

• Cancer
• Chronic bronchitis
• Emphysema
• Pneumonia
• Worsening of asthma and allergies

Important Points

• - Smoking damages the heart and blood vessels.
• - Smoking speeds up the clogging and narrowing of coronary arteries.
• - This can reduce the flow of blood to the heart and increases the risk of heart attack.
• - Tobacco smoke contains thousands of chemicals.
• - Nicotine is an addictive drug that affects brain and muscle activity and increases blood pressure, making the heart work harder.
• - Carbon monoxide is a poisonous gas that replaces oxygen in the blood, reducing the supply of oxygen to the heart and other organs.
• - If you smoke, your risk of heart attack is more than twice as high as someone who does not smoke.
• - If you smoke, your risk of stroke is more than twice as high as someone who does not smoke.
• - Smoking also causes cancer, chronic bronchitis, emphysema, early morning cough, pneumonia, and worsening of asthma and allergies.

Remember

• - Smoking = harmful to heart and blood vessels
• - Nicotine = increases blood pressure, makes heart work harder
• - Carbon monoxide = replaces oxygen in blood
• - Smoking = speeds up clogging and narrowing of coronary arteries
• - Smokers = more than twice as likely to have heart attack or stroke
• - Smoking also causes cancer, bronchitis, emphysema
• - Best prevention = do not smoke
• - Quitting smoking = reduces risk

Common Mistakes

• 1. Thinking smoking only affects the lungs.
• - Smoking also severely affects the heart and blood vessels.
• 2. Believing nicotine is the only harmful chemical in smoke.
• - Tobacco smoke contains thousands of harmful chemicals, including carbon monoxide and tar.
• 3. Thinking smoking only harms the smoker.
• - Secondhand smoke also harms others.
• 4. Believing the risk of heart attack is only slightly higher for smokers.
• - The risk of heart attack and stroke is more than twice as high for smokers.
• 5. Thinking quitting smoking has no immediate benefit.
• - Risk of heart attack and stroke decreases within months of quitting.
• 6. Forgetting that carbon monoxide reduces oxygen supply.
• - Carbon monoxide binds to haemoglobin, reducing oxygen delivery to the heart.
• 7. Thinking heart disease only affects older smokers.
• - Heart disease can affect younger smokers too.

Quick Revision

60-Second Revision

• Smoking = damages heart and blood vessels
• Nicotine = increases blood pressure, makes heart work harder
• Carbon monoxide = replaces oxygen in blood
• Smoking = speeds up clogging and narrowing of coronary arteries
• Smokers = more than twice as likely to have heart attack or stroke
• Smoking also causes = cancer, chronic bronchitis, emphysema, pneumonia
• Best prevention = do not smoke
• Quitting smoking = reduces risk within months
• Warning: Smoking harms not only the lungs but also the heart and blood vessels.