Quitting smoking at any age is beneficial: 58.04 Kb   

This graph developed by Fletcher and Peto*, show the gradual loss of lung function in a never smoker compared to the more rapid loss of lung function in a smoker.  It also shows that by quitting smoking at any age the rate of lung function lost reverts to that of a non-smoker and results in years of life gained.  Reinforce the message that it is never too late to quit.

* Fletcher, C. and R. Peto, The natural history of chronic airflow obstruction. Br Med J, 1977. 1(6077): p. 1645-8.