Actually, it's worth noting (I'm not a doctor, but I have a rather thorough understanding of drugs and their effects on the body), the liver is FANTASTIC at repairing itself. There are cases where people wrecked their livers in a matter of days/weeks/months by taking too much acetaminophen (....'s terrible for your liver), and months later were scanned to find that their livers had fully repaired themselves.
Granted there are no complications (like, pretty much as long as you don't have hepatitis), even if vaping WAS harmful for your liver (which it's probably not), your body would most definitely be able to contend with whatever damage it was causing.
The liver's a tough one.