Method I discovered an unpopular

[ShinyScissors]

So I'm currently at work watching modules about workplace safety. I'm not really paying much attention since most of the material is common sense. Though, I hear something that had me immediately pause the narrated module.
Low & behold:


As you can see I did a quick google search to confirm my suspicions. I hear a lot of people hopelessly seek for painless yet easily available methods so I wanted to share. Though

 

[BookPostponed]

what would you do for SI?

 

[UKscotty]

Carbon dioxide is far from painless. It infact the only gas humans can detect the high presence of. It will trigger the choking and set your SI to max.

It's Carbon Monoxide needed for painless ctb

 

[Message In A Bottle]

People died this way on a live stream

Video: Moment dry ice thrown in pool at party causing death of three people | Daily Mail Online

Moment dry ice thrown in pool at Moscow blogger Ekaterina Didenko 29th birthday party causing death of three people due to carbon monoxide poisoning. The partygoers are wearing protect suits and goggles, aware that they face dangers.

www.dailymail.co.uk

The husband was noticeably struggling before he went so I can't say it was 100% painless…

 

[ShinyScissors]

I didn't finish this post but I was just asking if anyone else knew any more info on this method