Lesson 3 of 4
Smoking
Goal: Describe how smoking harms the body and why it is hard to stop.

Nicotine is the addictive drug in tobacco smoke. It keeps a person smoking while the smoke harms the whole body.
- Heart and blood vessels. Nicotine makes the heart beat faster and the blood vessels narrower, so blood pressure rises. A heart attack or a stroke becomes more likely.
- Mouth and throat. The chemicals in tar that cause lung cancer also cause cancer of the mouth and throat.
- Stopping is hard, but people do it. Withdrawal symptoms usually ease over a few weeks. Nicotine patches or gum from a pharmacy ease the craving without the smoke.
- Most vapes contain nicotine too, so vaping is also addictive.
What smoke does inside the lungs is in Breathing and gas exchange, lesson 7.
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Key words in this lesson
Drug A substance that changes the way the body or mind works
Nicotine The addictive drug in tobacco smoke
Addiction Depending on a drug and finding it very hard to stop
Withdrawal symptoms Unpleasant effects felt when an addicted person stops taking a drug
Craving A strong urge to take a drug again
