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problems caused by hazardous substances, hazardous substances can affect your, dangers of hazardous substances, effects of hazardous substances include, health effects of hazardous substances, what hazardous substances can cause illness, types of harm hazardous substances can cause, hazards and hazardous substances, risk of hazardous substances, substances hazardous to health, hazards caused by chemicals, hazards of chemicals and substances, chemical hazards and hazardous substances, hazardous materials and substances hazards, hazardous chemicals and their effects, what hazardous substances are, hazards may be caused by, substances hazardous to the environment, health hazards related to hazardous chemicals, why are chemicals hazardous, what makes a chemical hazardous, what are the hazard of chemicals