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In this slide i am going to tell you the Negative affect's that smoking has for your respiratory system.Smoking is bad for all part's of your body,but it brings the worst problems for your respiratory system.In a Cigarette there is a chemical called a Tar.Now this chemical unfortunately stick's in a tiny hairs in your lung called a Cilia.At first we have to find out what is the job of Cilia. In the easiest form Cilia basically cleans all the harmful substances from your lung.The interesting thing is when you smoke, the harmful tar will cover all your tiny hairs in your lung or Cilia When the tar cover's your Cilia your cilia won't work to keep out all the harmful stuff away from your lung and eventually with out the help from your cilia, harmful stuff will enter your lung.Without the help of you cilia in your lung all the harmful substances in your smoke will block out your mucus slides and eventually down into your lungs and it will block your airways so you can't breath in and you can't breath carbon dioxide out.Have you ever noticed that everyone who smokes coughs a lot. This has a scientific reason behind it.People who smoke cough because they are trying to get the dirty chemicals in their mucus out of the lung.Did you know that when you smoke over 4000 harmful chemicals are getting into your body.Have you ever noticed that when people start smoking they always say that they have a sore throat. There is a scientific reason behind this too.When you smoke the bad chemicals will enter your mouth and your trachea and the chemicals will burn down in your mouth.When your cilia in your lung doesn't work all the 4000 bad chemicals i told you about will go straight into your lung.When these chemicals reach into your lung they will attack everything they see in your lung.Now this is how cancer is created.When the chemicals kill your important cells cancer is created.Smoking also makes your alveoli in your lung more like a round shape.This has a very bad effect on your lungs because this means that there is going to be less oxygen in filling into your lungs.Even if you don't smoke and you breath someone else's smoke it will cause problems for your lugs,this is called a second hand smoke and it is just like smoking itself..As if it's not bad enough already tar is made up of several different chemicals that could causing cancer.Now i'm going to tell you some of the cancers that are caused by smoking.There is lung cancer,mouth cancer and throat cancer and it also causes chronic bronchitis which basically mean swelling up your air passage which makes it harder for you to breath. .If you ask anyone they say that smoking is very addictive this is because there is a substance in the smokes that make it very addictive and every time you smoke again there is more chances of them getting cancer .whenever we exhale the lungs are never empty they have a little oxygen left in them,but when you smoke there is only bad chemicals from the smoke that remain in your lung when you exhale. Smoke also contains a chemical in them called nicotine which kills most of the cells in your body. But on the bright side you can always make up for what you did. Remember that smoking is like a poison for your respiratory system and every time you smoke again it will make it worse.You can always quit smoking and eventually in time all your cells will eventually get better and stronger and your coughing will stop you won't have a sore throat anymore and your cilia in time will eventually start working again, but if you smoke a lot, in some cases your cilia might die and there is nothing to do about it.Thank you for listening to my presentation and i hope you learned why smoking is bad for your respiratory system and remember never smoke and never go into places where there are smokes.