Most of those working with solvents on a daily bases in workshop have masks that they stopped wearing because it's annoying, but they claim acetone and all of those are rubbish to health. They really hate it for some reason.
I even try to say it's maybe not that bad and found in fruit, thought in way lower amount and they say, come to work with us and you'll see.
Many jobs make you breath fumes and dust of all sort and it's known some die from it.
It's all a matter of proportions per metabolism of course, the body can handle a fair amount of toxins until it's too much.
Anyway I have my mask and never wore it, only googles and gloves... So I'm not too careful either but just wonder...