>>33779
>yes but vaccination doesn't immediately cause you to swell up and die.
Occasionally, it does.
Conversely, mercury poisoning is fairly slow - if you don't try to swim in the stuff and then sunbathe next to it.
Remember, it's about concentration of vapours and at the time when mercury was used like that there were no problems with how to improve ventilation, more with how to decrease it. Terrariums without fresh air intake but with conditioners weren't invented yet.