Background: Diaphragm is very important structure and landmark that separates thoracic and abdominal cavities in addition to its role in respiration. There is a lot of variations in the shape position, outline and heights of both the domes of the diaphragm. These can vary in patients having smoking history or having other pathologies like pulmonary collapse, pneumonias, infarction, rib fracture and pleurisy. These can lead to some wrong diagnosis which unwarranted and unnecessary treatments for the underlying pathologies which infect do not exist. Material and Methods: Thirty nine subjects were studied with their chest x-rays of frontal and lateral views. This included 13 (33%) females and 26 male (67%). Results: Right dome was raised in most of the cases barring those who fall in the smokers group. The height was more in the 46-60 years age group. The height of the domes was falling at the level of D10 and D11 levels. Conclusion: The study confirms the change of level and height of the dome among smokers and nonsmokers and as per the different age groups.