Smoking is one of the major cause of preventable morbidity and mortality in both developed and also in developing countries. Tobacco contains over 4000 chemical compounds and at least 400 toxins of which 60 are carcinogenic and its use is linked to over 25 diseases. The main cause of death related to smoking are atherosclerosis and cancer. Clinical observations in some areas shows that over 60% of heart diseases under 40 years of age are due to cigarette smoking. Regular smoking of any number of cigarettes is one of the important common risk factor for the development of myocardial infarction. The study is to see changes in ECG in smokers compared to nonsmokers. The study was conducted in young individuals of age between 18yrs to 25yrs .The individuals who does not smoke were selected as control and individuals who smoke are selected, ECG was recorded in control and smokers. Short term smoking of duration 02 to 05yrs produce significant cardiac electrical activity predisposing to cardiac risk. Study results showed that smokers are prone to cardiovascular risk. So in earlier stage abstinence from smoking can revert back the cardiovascular changes to nearly normal or in more severe cases to recovery with little residual damage to the heart.