Source: BBC News
Smokers need to quit cigarettes rather than cut back on them to significantly lower their risk of heart disease and stroke, a large BMJ study suggests.
People who smoked even one cigarette a day were still about 50% more likely to develop heart disease and 30% more likely to have a stroke than people who had never smoked, researchers said.
They said it showed there was no safe level of smoking for such diseases.
But an expert said people who cut down were more likely to stop.
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Cardiovascular disease, not cancer, is the greatest mortality risk for smoking, causing about 48% of smoking-related premature deaths.
While the percentage of adults in the UK who smoked had been falling, the proportion of people who smoked one to five cigarettes a day had been rising steadily, researchers said.