In relation to cardiovascular disease, smoking is linked to atherosclerosis (hardening and narrowing of the arteries), it reduces "good" blood cholesterol which transports fat away from artery walls, and raises blood pressure.
In relation to lung and other cancers, carcinogens (cancer causing agents) in tobacco cause damage to cells in the smoker’s body that, over time, can become cancerous.
Studies demonstrate that a person's risk of cardiovascular disease starts to decline very soon after they stop smoking. New Zealand's Cardiovascular Risk Guidelines state that the risk of heart attack or stroke is significantly reduced within 1 year of stopping, and reaches that of a non-smoker within 3-5 years. Lung cancer risk can also be reversed but it takes a lot
longer - perhaps 10-15 years.
In relation to lung and other cancers, carcinogens (cancer causing agents) in tobacco cause damage to cells in the smoker’s body that, over time, can become cancerous.
Studies demonstrate that a person's risk of cardiovascular disease starts to decline very soon after they stop smoking. New Zealand's Cardiovascular Risk Guidelines state that the risk of heart attack or stroke is significantly reduced within 1 year of stopping, and reaches that of a non-smoker within 3-5 years. Lung cancer risk can also be reversed but it takes a lot
longer - perhaps 10-15 years. 
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