On: I bought a CO2 monitor and it broke me

[userbinator]

No, I think he's correct based on the study linked from this other interesting comment here: https://news.ycombinator.com/item?id=34651244

[deadbeeves → userbinator]

The linked study directly states that loss of consciousness occurs after ~7 minutes of exposure to 10% CO2.

[thfuran → deadbeeves]

And that's the obvious threshold. After all, no one can tell whether they've been drinking until they wake up on the floor, right?