What it’s used for:
Since ancient times, arsenic has been used as a poison. These days, it’s commonly found in rat poison, pesticide, and treated wood.
How it affects the body:
It’s basic: arsenic is toxic. Low doses can cause nausea, vomiting, diarrhea, and stomach cramps. Larger doses can cause abnormal heart beat, damage to blood vessels, skin warts, a feeling of “pins and needles” on the hands and feet, and death. Inhaling arsenic can lead to lung cancer1.