The damage one cigarette can do
Smoking just one cigarette a day carries a much higher risk of developing coronary heart disease (CHD) and stroke than previously thought.
Indeed, the risk is as much as half that from smoking 20 cigarettes daily, according to a review of the evidence published in the BMJ.
After analysing 141 prospective studies examining the association between smoking and CHD or stroke in millions of generally healthy people, the researchers conclude that no safe level of smoking exists.
They say these findings have important consequences for smokers who