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Active smokers are at absolute risk where as passive smokers are at relative risk. Passive smokers are associated with respiratory problems or heart problems which has good prognosis but the active smokers are at risk of many diseases that have poor prognosis like cancers. In active smoking the carcinogens are relatively much much higher than passive smoking. Passive smoking is injurious to health because it is a kind of air pollution. Active smoking is even more injurious to health because it is a risk factor for many disease.