Often, smokers who develop this will require complex and risky heart bypass surgery.
If you smoke for a lifetime, there is a 50% chance that your eventual death will be smoking-related - half of all these deaths will be in middle age.
Smoking also increases the risk of having a stroke.
Lung problems
Another primary health risk associated with smoking are lung cancer, which kills more than 20,000 people in the UK every year.
US studies have shown that men who smoke increase their chances of dying from the disease by more than 22 times.
Women who smoke increase this risk by nearly 12 times.
Lung cancer is a difficult cancer to treat - long term survival rates are poor.
Smoking also increases the risk of oral, uterine, liver, kidney, bladder, stomach, and cervical cancers, and leukaemia.
Another health problem associated with tobacco is emphysema, which, when combined with chronic bronchitis, produces chronic obstructive pulmonary disease.
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