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What's some really unpopular opinion you have?
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Yes, in Switzerland, they primarily use nitrogen suffocation. This is good because the way your body detects a lack of oxygen is a build up of CO2, while nitrogen is already 70% of the air so it's ignored. So you don't feel like you're suffocating, you just run out of oxygen and go hypoxic.
The exact gas they use might not be pure nitrogen, but I think that's primarily what it is.