'Social smokers' are being encouraged to stop.
Today is National No Smoking Day and the Irish Heart Foundation is urging people to kick the habit this Ash Wednesday.
One million people smoke in Ireland and a quarter are regarded as occasional or social smokers.
The group says people who smoke 20 cigarettes a day spend around three-and-a-half-thousand euros each year on cigarettes.
Dr. Ross Morgan, the Chairman of Ash Ireland says occasional smokers need to realise the impacts:
