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Case Study: Heart Disease Is there a correlation between passive smoking and coronary heart disease? In this case study I will be analysing evidence for and against claims that passive smoking increases the risk of coronary heart disease. The first piece of evidence of a link between passive smoking and heart disease was first discussed in the mid 80s and research into the evidence is ongoing. Regular intake of second hand smoke increases coronary heart disease risk by approximately 25%. Evidence has shown that even small doses of second hand tobacco smoke can have a large effect on coronary heart disease, whilst further exposure has a small additional effect. Environmental tobacco smoke increases blood platelet activity which causes blood to thicken. The thicker blood then has a greater tendency to clot. These blood clots prevent oxygen from getting to the heart via the coronary arteries, causing the heart muscle...

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