ya ryt......... it causes various range of disease including cataract,tuberculosis,cervical,kidney,pancreatic and stomach cancer,acute myeloid leukemia,hmm lemme say almost every organ of body. one who doesn't smoke but stays around heavy smokers are also affected. we can include them on passive smokers...and they are affected with disease such as heart and lungs disease but have less chance thn that of direct smokers.