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Benzene is a widely used chemical formed from both natural processes and human activities.  Benzene inhalation can cause drowsiness, dizziness, and loss of consciousness; long-term effects include anemia and leukemia.

EPA: Benzene 

pdf: Health Effects of Benzene Exposure Presentation from the University of Maryland School of Nursing

CDC: Facts about Benzene

Benzene is also found at oil and gas drilling sites. A study published by researchers at the National Institute for Occupational Health and Safety found high levels of benzene in oil and gas workers.

Read: Fracking workers exposed to dangerous amounts of benzene, study says