Draught is the british (and Canada, other places as well) spelling for draft as in draft beer. Not trying to be grammar nazi, just thought it was funny cause the typo was somewhat well placed.
What did water ever do to you?
We are mostly not human. Our bodies contain a vast assortment of usually symbiotic species so it is appropriate to think ecologically, more co-evolution.
It seems reasonable that flora and fauna responses to environmental factors that in of themselves may not be directly relevant to a human, but that we benefit from the interaction as a side effect e.g. useful compounds being produced naturally, partially synthesized from plant life even though the direct plant product may show no sign of helping us because we cannot yet process it artificially. Hope that makes sense.
Having said that, the Japanese researcher I mentioned above does say some kinds of hinoki oil produce comparable effects to traveling in forests.
Now seems like a good time to plug my favorite anime on tiny invisible life forms:
Mushishi http://www.imdb.com/title/tt0807832/