
Every smoked cigarette cuts 20 minutes off a person's life, a study says.
An analysis by University College London (UCL) scientists, commissioned by the government, found that the harm caused by smoking takes an average of 22 minutes per cigarette off a woman's life expectancy, with a loss of 17 minutes for a male.
The findings are up to twice as much as previous estimates that claimed a single cigarette costs 11 minutes of a person's life.
The researchers said the harm caused by smoking was cumulative, and that the sooner a person stopped smoking and the more cigarettes they avoided smoking, the longer they lived.
Their analysis suggests that if a smoker who smokes 10 cigarettes a day quits on January 1, then they will have prevented a whole day of their life being wasted by January 8.
Those who do away with this habit can then extend their life by a week if they don't smoke by February 20 and by a month if they continue until August 5.
Cigarettes kill around 80,000 Britons a year and are responsible for a quarter of all cancer cases.
Andrew Gwynne, a health minister, told The Telegraph: "The evidence is undeniable: smoking doesn't just shorten your life, it robs the quality of the years you have left."
"But here's the good news: no matter how long you've smoked, quitting today is one of the most powerful decisions you can make for your health. On the first day of leaving, your body begins to heal. Within hours, your heart rate slows and oxygen flows more freely to your heart and lungs.
Over time, the benefits become complicated: after nine months, your lung function increases; After a year, the risk of heart attack will be halved. And after 10 years, your risk of dying from lung cancer will be reduced by 50 percent compared to someone who continues to smoke," he said.