One study found that smoking one cigarette a day increased the risk of heart disease by 50 percent. The risk of stroke or stroke also increases by 30 percent.
In the case of women, the risk is even higher, at 56 percent. Researchers now say that there is no benefit in reducing smoking without quitting.
"There is no safe level of smoking for heart disease or stroke," says BMJ research.
But another expert says it is easier for those who are smoking to quit.
The biggest risk of smoking is not cancer, but heart disease. Heart disease accounts for 48 percent of smoking deaths.
Studies have shown that the number of smokers in Britain as a whole is declining, but the number of people who smoke one to five cigarettes a day is increasing proportionately.
A study of 100 smokers who smoked at least 20 cigarettes a day found that seven of them had either a heart attack or a stroke.
Alan Hacks, a professor at the Cancer Institute at University College London, who led the new study, told the BBC: "There is a tendency in some countries to reduce the level of smoking among extra smokers, which they think reduces their risk.But while this is true of cancer, it is also true of heart attacks or strokes. "
According to Professor Hacks, 'smoking carries a much higher risk of heart disease or stroke than cancer.'
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