What gas is frequently utilized in suicide bags?

The use of nitrogen in suicide bags is based on its properties as an inert gas, which means it does not react with other substances and does not support combustion. When someone uses a nitrogen-filled bag, they are typically seeking a method that is painless and non-disruptive to the body in terms of physical reactions. Breathing in nitrogen displaces oxygen in the bag, leading to a situation where there is not enough oxygen to sustain consciousness, resulting in unconsciousness and, ultimately, death due to hypoxia.

In contrast, while the other gases listed have various implications and uses, they are either toxic or have different physiological effects that do not align with the common method associated with suicide bags. Carbon dioxide, for instance, can lead to suffocation but would be uncomfortable and cause distress in the process. Cyanide is a toxic substance that causes rapid death through cellular asphyxiation but is not commonly associated with a humane or painless means. Acetylene, primarily used as a fuel gas, is highly flammable and poses a significant risk in unintended scenarios.

Therefore, nitrogen is chosen for its non-toxic characteristics and the way it can induce unconsciousness without the painful or distressing side effects associated with other gases.