Lead – principal route of exposure in the general population is food, but water and air are also responsible.
Lead causes chronic poisoning; is neurotoxic, hematotoxic and nephrotoxic. It may also affect blood pressure and the reproductive system
Benzene – acute exposure: depress the CNS, unconsciousness and death, cause fatal cardiac arrythmias
Chronic exposure in the workplace: bone marrow damage, anemia, leucopenia or thrombocytopenia