Science case study

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                                                                                                        GULEED SUDI 11D

        SMOKING BAN

SMOKING BAN

GULEED SUDI 11D

CONTENTS PAGE:

  • Introduction:                                                                                   3

  • Scientific background:                                                                   4

  • For and Against:                                                                          16

  • Comparing For and Against:                                                       19

  • Conclusion:                                                                                  22

  • Bibliography:                                                                                23

INTRODUCTION

For my GSCE science coursework I have been assigned to study a scientific question in detail. The question I have chosen to study is “Should there be a smoking ban?” and the reason I have chosen this question is because it is a very contemporary topic which will affect more or less everybody in the UK. The smoking ban will be introduced on the 1st of July 2007 and smoking will be unlawful in public and enclosed work places forward of this date. The smoking ban has been made to ensure that there is the least possible passive smoke (passive smoke is just other peoples smoke and is also known as second-hand smoke.)

“Definition of a reliable source: Reliable sources are authors or publications regarded as trustworthy or authoritative in relation to the subject at hand. Reliable publications are those with an established structure for fact-checking and editorial oversight. The reliability of a source depends on the context: a world-renowned mathematician is not a reliable source about biology. In general, an article should use the most reliable and appropriate published sources to cover all majority and significant-minority published views.”

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SCIENTIFIC BACKGROUND

  •  What is in a cigarette?

(() this diagram is more likely to be reliable because the diagram comes from a website that has to do greatly with smoking.

Cigarettes contain many ingredients which makes it very addictive and satisfying. These ingredients include:

Nicotine – is found in tobacco and is very addictive. Nicotine is delivered to a smoker’s lung in the form of mixed smoke particles and gas. The nicotine is then rapidly absorbed into the blood and reaches the brain within about 10 seconds. At this point the smoker experiences a nicotine "hit" - this is when the receptors in the brain produce chemicals called dopamines.  The brain soon comes to expect regular doses (or "hits") of nicotine and suffers withdrawal symptoms when the supply is interrupted. Nicotine also stimulates the central nervous system which causes the heart to beat faster and increase blood pressure. This results in the heart needing more oxygen.

Carbon Monoxide – is a poisonous gas which causes breathing difficulties as carbon monoxide (CO) mixes with blood which contains oxygen. Up to 15% of oxygen may be deprived from a smoker’s blood because blood may carry CO instead of oxygen resulting in the heart having to work harder which can cause coronary heart disease and circulation problems.

Tar – is a mixture of chemicals that is a residue of tobacco smoke containing by products of combustion. About 70% of tar is left in smokers lungs’ when they inhale cigarettes which can cause serious lung diseases.

Hydrogen cyanide – is a poisonous gas which accounts for about 5-8 percent of the out put of a burning cigarette. This poisonous gas reduces the body’s ability to transport oxygen.

Ammonia – is found in cleaning fluids. Ammonia ‘freebases’ the nicotine in a cigarette and ammonia also speeds up the delivery of nicotine by raising the pH of tobacco smoke. Raising the pH of smoke changes the chemical form of nicotine so that it is more rapidly absorbed by the body which can result in nicotine hits.

Sugar – sugar accounts for about 3% of the total weight of a cigarette and when it is lit it begins to burn and produce acetaldehyde which enhances the effect of nicotine.

Chocolate and honey – helps disguise the smell of nicotine and makes the cigarette more pleasant.  

Menthol – Menthol numbs the throat so the throat cannot feel the irritating feeling caused by tobacco.

Cigarettes contain about 4000 poisonous chemicals including tar, carbon monoxide, ammonia, arsenic, formaldehyde, cadmium, shellac, benzene and cyanide.

I obtained the above information from the websites shown below:

(his is a reliable site because the people who made this site are doctors and scientists and also this information has been updated recently.

( This is a reliable site as this is a known website and this site could get itself in trouble if it published false information about health. Also this information was written recently.

  •  Effects of smoking

Although smoking does relieve stress, fulfils addictions and is a source of pleasure, smoking kills hundreds of thousands of people every year.

The effects of smoking rely on a number of factors:

http://www.ash.org.uk/html/factsheets/html/fact02.html - this website is reliable as it is a website from the government.

Smoking causes a number of health problems and also smoking can develop a number of health problems such as lung cancer etc. By just smoking one cigarette, a person’s blood pressure and heart rate increases and also decreases the blood flow to body extremities such as the fingers and toes. Also because of the nicotine in a cigarette, the central nervous system is stimulated making the heart beat faster which results in the heart needing more oxygen. Smokers also can experience dizziness, nausea, watery eyes, and acid in the stomach and also a smoker’s appetite, taste and smell are weakened.

        

Other effects of cigarette smoking:

  • Smokers typically experience shortness of breath, persistent coughs, reduced fitness, yellow stains on fingers and teeth and decreased sense of taste and smell.
  • Smokers have more colds and flu than non-smokers and find it harder to recover from minor illnesses.
  • Smoking can cause impotence in men, while women who smoke are less fertile than non-smokers.
  • People who smoke tend to have facial wrinkles appearing much earlier and, in general, look older than non-smokers of the same age.

Smokers have an increased risk of developing: 

  • respiratory infections such as pneumonia and chronic bronchitis;
  • emphysema (a progressive and potentially fatal lung disease);
  • heart attack and coronary disease;
  • cancer of the lung, throat, mouth, bladder, kidney, pancreas, cervix, stomach;
  • stomach ulcers; and
  • Peripheral vascular disease due to decreased blood flow to the legs.

A person who is dependent on cigarettes may find that they experience withdrawal symptoms when they cut down or stop smoking cigarettes. These can include:

  • increased nervousness and tension;
  • agitation;
  • loss of concentration;
  • changes to sleep patterns;
  • headaches;
  • coughs; and
  • Cravings.

( although this website was not written recently, this website is still reliable because it is all about health and it tells you also what affects the health of people in detail such as smoking.

  • Non-smokers affected by smoke

The short-term effects of passive smoking are:

  • irritated eyes;
  • headache;
  • dizziness;
  • nausea;
  • lung function is decreased in asthma sufferers;
  • Blood flow through the heart is reduced.

The long-term effects of passive smoking are:

  • increased risk of heart disease;
  • middle-ear disease;
  • lung cancer;
  • asthmatic attacks and reduced lung function in children;
  • behavioral problems in children;
  • Premature birth and miscarriage.        

()This information is reliable as it comes from a website which has a section on health and the things that affect health such as smoking.

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Many people in the UK are affected by the tobacco smoke of others. These people breathe in the smoke of other peoples tobacco smoke. This is called passive smoking. About 70% of the UK are affected by passive smoking and are denied the freedom to go about their lives in a smoke-free environment. Not only does passive smoking affect people around the environment they live in but also in their work place and homes.

( This information is reliable as it comes from a well known website and also this information comes from an article all about smoking. Also ...

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