Introduction:A chest radiograph, although being a rather insensitive diagnostic tool, is nevertheless the most common radiological method used to screen individuals who are clinically suspected. Because of the lack of specificity of the term 'reticulonodular pattern,' a chest X-ray may fail to accurately identify many conditions, causing them to go undetected. Hence study was planned to assess the usefulness of HRCT in diagnosis of Interstitial Lung Diseases among Smokers Materials and method:Simple random sampling method was used to select the sample and allocate according to the inclusive and exclusive criteria. A detailed history, complete physical examination and routine & appropriate investigations were done for all patients. Result:RB-ILD was the most common diagnosis among smokers (48 percent), which is consistent with the fact that a connection to smoking has previously been established. The NSIP was the second most prevalent (20 percent), and the UIP was the third most prevalent (16 percent). There was a decrease in the number of cases of DIP and Early ILD. Conclusion: On the contrary hand, smoking appears to offer some protection against sarcoidosis, organizing pneumonia, and hypersensitivity pneumonitis (HP) (OP). A crucial part of the differential diagnosis is played by high-resolution computed tomography, or HRCT. RB is thought to be a marker for smoking exposure since it occurs quite often among smokers.