... tolerance and increases the tendency for blood to clot. The main reason that cigarette smoking greatly increases the risk of coronary heart disease is that it decreases the amount of HDL (High-density lipoproteins), which is the good form of Cholesterol as opposed to the bad form that is LDL (Low-density lipoproteins). Another factor, which leads to CHD, is related to Carbon Monoxide levels. Carbon Monoxide from tobacco smoke reduces the ability of red blood cells to carry oxygen, which seems to increase the risk of damage to endothelial cells in arteries. Other than this, tobacco smoke contains Nicotine. Nicotine is addictive and effects the brains of smokers. Studies carried out, show that nicotine is taken into the brain very rapidly, where it acts as a type of poisonous inhibitor. It also mimics another neurotransmitter, which is called Dopamine. This inhibition causes long-lasting changes to cell connections and may explain why ...

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