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[A] The following conclusions are supported by good evidence:
Observational data suggests an association between consumption of arsenic in drinking water and increased lung cancer risk. Health Canada's guideline for water quality identifies a maximum arsenic content of 0.010 mg/L.
A controlled trial indicates that in smokers, beta-carotene supplements (=20 mg/day) are associated with an increased risk of lung cancer. Heavy smoking and genetic variations further increase the risk of