Suppose you have an Earth-like planet which (for reasons completely unrelated to the question) spontaneously generates and maintains an atmosphere with an atmospheric ethyl alcohol concentration of 1%. This cannot be altered no matter what processed is performed. For instance, an attempt to diffuse the alcohol out of the air en masse will simply result in more ethyl alcohol being produce. For simplicity's sake, let us also assume that the elements used to construct the alcohol are being drawn from the planet's crust. (This gives rise to an idea that this is a result of a unique plant generating this atmosphere using a corrupted version of photosynthesis, but that's the what this question is seeking to explore.)
The question is as follows: Given this planet of 1% atmospheric ethyl alcohol, what effect would this have on the human population who lived there? After all, gas exchange in the lungs is accomplished through diffusion, and human blood does not (under normal circumstances) have ethyl alcohol produced naturally within it.
I'm primarily seeking an answer from an anatomical standpoint, but sociological approaches will also be appreciated. And, if you have the time for it, the original version of this question was going to use 14% ethyl alcohol concentration, but I quickly came to the assumption that would likely kill the human race, so if you can justify or disprove that, I would appreciate it.