Buy now to get key insights from James Nestor's Breath. Sample Insights 1) For the past century, the prevailing belief in Western medicine was that the nose was more or less an ancillary organ. We should breathe out of it if we can, the thinking went, but if not, no problem. That’s what the mouth is for. 2) The nose is a very important part of our body. It is a filter that prevents harmful things from getting into the body.