Benzene is relatively often encountered in the environment, as it is used in the production of certain types of rubbers, lubricants, detergents, dyes, drugs and pesticides. It also is a natural component of gasoline, cigarette smoke and crude oil. It naturally forms from volcanoes, forest fires, etc. Exposure may lead to cancer and other severe diseases such as Acute Myeloid Leukemia (AML), Chronic Lymphocytic Leukemia (CLL), other cancers of blood cells, etc.