FEV1 this decline (7), later several studies have shown

FEV1 is is the most widely used lung functionparameter in clinical practice and researches (6). In 1977, the landmark study ofFletcher and Peto showed that there is an annual decline in FEV1 with age and certainfactors may accelerate this decline (7), later several studies have shown thatlow value of FEV1 is an independent predictor and powerful marker of increasedrisk of not only COPD, but also of lung cancer, cardiovascular diseases, andpremature death (8). Smoking has been shown toaccelerate this decline in FEV1, which is modifiable, and can be attenuated bysmoking cessation. (9) In the light of an ever-increasingprevalence of smoking; 12% of all death worldwide are attributed to tobacco (10) use and since smoking is the mostimportant preventable risk factor in mortality rates, several smoking cessationprograms were initiated (11) and one approach put spirometryinto action and use the accelerated decline in FEV1 as a tool to help smoker quit,this was the dawn of “lung age concept”(12).

Simply, taking into the accountage, sex, height and ethnicity, the “lung age” of an individual, can be definedas the age at which the measured FEV1 matches the predicted value of anon-smoker “normal” individual(12). Morris andTemple (1985) calculate the individual lung age by rearranging the regressionequation constructed for predicting normal reference value of force expiratoryvolume at one second (FEV1) to solve for lung age( 12).They intelligentlysimplify the state of the apparent premature lung aging supported withspirometric data ;that is difficult to be conceived by the public ;to an easiermore familiar clear message ,specifically  to the smokers, that:  their lung age is older than their realactual chronological  age is; topsychologically warn them against the pulmonary impairment caused by smoking,hoping that would be a potent motivator to quit smoking.Smoking in Jordan has a highprevalence where Tobacco use data from the latest survey results as at31 December 2016 Current cigarette smoking among youth is 17.

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3 % among malesand 5.4  among female ,tobacco use amongYouth is 24% (here you can add your manual refrence) (13) including the phenomenal increasein the use of water pipe(14)(15) and lately electronic cigarette(16). It is compellingand urgent for the heath care professional to help persuade cigarette smokersto quit smoking and reduce suffering, pain, and premature deaths. Taking “lungage” concept  approach  in consideration it is mandatory to testits  applicability to suit Jordanianpopulation according to the American ThoracicSociety guidelines for spirometry which recommend that predictive equations bederived from a ‘relevant’ population (17), Toour knowledge, several groups have reported revised equations predicting lungage in worldwide populations.

8–13 The American Thoracic Society guidelines for Spirometryrecommend that predictive equations be derived from a ‘relevant’population18and should be updated at least every 10 years.19 principally   that modern automated spirometer usuallyincorporate a choice of lung age equations. As far as we know, six lung age equation have beenpublished around the world several groups have reported revised equations thatpredict lung age in populations.