SMOKING

1. SMOKING Nooreeen

2. Constituents of cigarette smoke • Ciggarette smoke contains a powerful drug called nicotine. • Nicotine is addictive. • This is the reason why the people who smoke find it very difficulyt to give up • Ciggarette smoke contains many different harmful substances like tar particulates and carbon monoxide

3. Nicotine • Nicotine affects the brain and makes people feel relaxed • It also affects the circulatory system • It increases the rate of heartbeat and blood pressure and smokers suffer from heart diseases

4. Tar and carbon monoxide • Tar can cause cancer • Chemicals in tar affect the cells that line the passageways leading to the lungs , and also the cells in the lungs themselves • They may damage the cell’s ability to control their division • Some of the cells may begin to divide over and over again uncontrolabally forming a lump called Tumor • Tar and carbon monoxide affect the cilia and the goblet cells that line the trachea and bronchi

5. Carbon monoxide anaesthetises the cilia so that they stop working • The smoke also makes the goblet cell work harder producing more mucus as there is no cilia to sweep it upwards , the mucus trickles down into the lungs • This makes the person cough • This prevents the oxygen easily diffusing from the alveoli into the blood • This condition is called emphysema • Carbon monoxide also reduces the oxygen carrying capacity of the blood

6. BYE BYE