Arsenic exposure can occur through:

Contaminated drinking water (especially from well water in certain regions).
Occupational exposure (mining, smelting, agriculture, glass, and semiconductor industries).
Seafood consumption (organic arsenic in fish is non-toxic but can elevate test results).
Pesticides and herbicides (previously used in agriculture).
Tobacco smoke (some cigarettes contain arsenic-based chemicals).

Health Risks of Arsenic Exposure:

Acute poisoning: Nausea, vomiting, diarrhea, abdominal pain, muscle cramps.
Chronic exposure: Skin changes, peripheral neuropathy, cardiovascular disease, kidney and liver damage, increased cancer risk.