What is rat poison called in cigarettes?

Answer 1

This is historical stuff. Decades ago, arsenic was used as a rat poison and also as a pesticide on tobacco and many other plants. Traces of pesticide remained on the plants and that's how it entered both the food-chain and tobacco. Although its use has been banned, traces of arsenic are absorbed by ALL plants from the environment. Drinking water contains arsenic from the same source. Government agencies set safe levels for it in drinking water. A tumbler of drinking water can contain the same amount of arsenic as hundreds of cigarettes and still be considered "safe".

"Healthy" oily fish and cereals contain the more modern rat poison, Vitamin D3. Another widely used rat poison is one of the most prescribed drugs, Warfarin.