Effect on airways

When you have asthma, air tubes (bronchial tubes) in your lungs react to things that bother them. These tubes swell, squeeze tighter, and make mucus. It's harder for air to get through the narrowed tubes. That's why you have trouble breathing during an asthma attack. Cigarette smoke can set off this reaction. Breathing in the smoke can make you cough, wheeze, and feel short of breath. 

Just say no!

You might think you can stop smoking whenever you want. But it's not that easy. Cigarettes contain nicotine. Nicotine is a powerful drug. You can become addicted to it. And that can make it hard to stop smoking. Besides nicotine, cigarette smoke contains more than 7,000 chemicals. Many of them are poisonous. And 69 of these chemicals have been linked to cancer.

Here are more reasons to not smoke cigarettes:

• Smoking spoils sports. Smoking makes it hard for oxygen to get to your muscles. This can affect how well you do in sports. People who smoke may run slower than nonsmokers. And they may be unable to run as far.

• Smoking harms your health. It damages your blood vessels by making them hard or stiff and less able to stretch. Your arteries also narrow due to plaque buildup. This makes your heart work harder because its blood flow is decreased. Smoking can cause lung disease, heart disease, and stroke.

• Smoking causes cancer. Smoking causes many types of cancer. It has been linked to cancer in the blood, bladder, cervix, colon, rectum, esophagus, kidney, larynx, liver, mouth, throat, pancreas, stomach, trachea, lung, and lung airways (bronchi).

• Smoking causes sickness. You're more likely to catch colds and the flu if you smoke. And it may take longer to get better when you're sick.

• Smoking dulls your senses. It makes it hard to taste and smell things. You won't enjoy your favorite foods as much.

• Smoking costs money. Don't let your money—and your health—go up in smoke. Make your body a smoke-free zone!