Are you still looking to kick that 30-a-day habit or just pinch the odd cigarette after a few drinks?

Lung cancer is the big danger for those who have smoked and scientists claim to have worked out a formula to calculate your chances of developing it.

A simple test has been developed by Omni Calculator to mark World No Tobacco Day on May 31 and help people calculate how at risk they are based on this research.

Greek researchers led by Maria Markaki of the University of Crete followed 65,000 Norwegians for 16 years and built a scientific model for assessing this risk.

It is worth remembering that smoking is known to contribute to a host of other cancers and diseases but lung cancer is the biggie.

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The effects of giving up smoking can be seen almost immediately:

- Within 20 minutes, the heart rate and blood pressure drop

- Within 12 hours, the carbon monoxide level in the blood drops to normal

- In 2 to 12 weeks circulation improves and lung function increases.

- A year after quitting the risk of coronary heart disease is about half that of a smoker’s.

- Between 5 and 15 years after quitting the stroke risk is reduced to that of a non-smoker.

- Fifteen years after quitting the risk of coronary heart disease is that of a person who never smoked.