Effect of 2-5 years of tobacco smoking on ventilatory function tests

Smoking is a pernicious scourge of the world today. There is paucity of literature on the effect of acute smoking on ventilatory functions. The present work is undertaken to study the effect of 2-5 years of tobacco smoking on ventilatory functions. The study group consisted of 30 male, young, healthy subjects, free from cardiopulmonary diseases and with history of smoking of 2-5 years duration, on an average of 10 cigarettes per day. The control group consisted of 30 age-and sex-matched healthy individuals who had naver smoked tobacco. The ventilatory function tests were carried out using electronic spriolyser. There was a significant lowering of the following parameters in smokers: Vital capacity (VC), inspiratory reserve volume (IRV), inspiratory capacity (IC), forced vital capacity (FVC), forced expiratory volume at the end of first second (FEV1), maximum midexpiratory flow (MMEF), peak expiratory flow (PEF), midexpiratory flow75 (MEF75), maximum voluntary ventilation (MVV). This study shows that 2-5 years of tobacco smoking leads to a definite tendency to narrowing of both the large and the small airways.