It's always in the fine print, somewhere, sometimes even not... Have you seen the TV commercials about weed killer lawsuits? Again, if you can smell it or taste it - even if you can't, be wary of what you expose yourself to. You build awesome machines, tweak and polish them with pride, but don't forget to take care of yourself too. Your body knows how to flush most of itself out, but overloads and constant exposure will get you.
Just like Jody's hoist scenario, LISTEN to the warning signs, and then MAINTAIN appropriately. Hydrate, hydrate, hydrate - it helps to flush out the bad stuff.
OK, 'nuff said - thank you for reading (really).