Far be it for me to call the following source a hallmark of credibility, but I found this to be interesting. If I'm concluding right (which is a stretch), maybe using pyro would actuall be good for me as someone who smokes. Seems the parent acid from which pyrogallol is extracted is a chemical unfriendly to cancer cells. DON'T TAKE MY WORD FOR ANY CLAIMS.
But then when we develop in a developing tank, pouring our chemistry from a beaker, there isn't a whole lot of hand contact any way.
http://en.wikipedia.org/wiki/Gallic_acid