Key points from article :
One cigarette a day increases chance of developing heart disease by 50%.
Likewise a 30% increase for having a stroke.
One cigarette a day still has half the risks of 20 a day.
Cardiovascular disease, not cancer, is the greatest mortality risk for smoking.
Analysis of 141 studies, published in the BMJ.
COMMENT: this should be a wake up call to social smokers
