ALT Illustration of no smoking icon. The text reads 'Smoking. Here's what happens when you quit for good.' The NHS logo is in the top right corner.

ALT Top half: illustration of a pair of lungs. The text reads 'After 8 hours. Your oxygen levels are recovering, and the harmful carbon monoxide level in your blood will have reduced by half.' Bottom half: illustration of a woman with lines representing fresh air near her nose and mouth. The text reads 'After 72 hours. If you notice that breathing feels easier, it's because the tubes in your lungs have started to relax. Also your energy will be increasing.' The NHS logo is in the top right corner.

ALT Top half: illustration of a woman with a hula hoop. The text reads 'After 2-12 weeks. Your circulation will have improved, making physical activity easier.' Bottom half: illustration of a man with lines representing fresh air near his nose and mouth. The text reads 'After 3-9 months. Any coughs, wheezing or breathing problems will be improving as your lung function increases by up to 10%.' The NHS logo is in the top right corner.

ALT Illustration of a woman in a yoga pose, with lines representing fresh air near her face. The text reads 'Your risk of heart attack will have halved compared with a smoker's.' The NHS logo is in the top right corner.

ALT An illustration of a father caring for his ill daughter in bed. He is offering her a drink, and she is blowing her nose. There is a thermometer showing a high temperature.