Oh, I’m familiar with the skin barrier, though molecule size and solubility play an important role. You can put a couple fingers are in acetone and blow into an organic vapor meter and it will show up right away. I don’t recommend that as a frequent activity but it’s safe enough for a demonstration...
OOPSEY! I failed to read your last sentence and immediately
ran to my acetone and vapor meter; dipped my fingers in the
acetone (several times!), blew into my vapor meter. It
showed up right away . . . . . again & again & again & again! - Then I read your last sentence. %O/
Things are getting %^#@ . . . blurrrrrrrrrrrrrrrrrryyyyyyyy!
AND . . . . VERRRRRRRRY EXCITINGGGGGGGGGGGGGGG! :o)