Time since quitting	Beneficial health changes that take place
20 minutes	Blood pressure and pulse rate return to normal.
8 hours	Nicotine and carbon monoxide levels in blood reduce by half, oxygen levels return to normal.
24 hours	Carbon monoxide will be eliminated from the body. Lungs start to clear out mucus and other smoking debris.
48 hours	There is no nicotine left in the body. Ability to taste and smell is greatly improved.
72 hours	Breathing becomes easier. Bronchial tubes begin to relax and energy levels increase.
2 - 12 weeks	Circulation improves.
3 - 9 months	Coughs, wheezing and breathing problems improve as lung function is increased by up to 10%.
1 year	Risk of a heart attack falls to about half that of a smoker.
10 years	Risk of lung cancer falls to half that of a smoker.
15 years	Risk of heart attack falls to the same as someone who has never smoked.