Try drinking out of a straw without the "Airpipe" connected to throat. The lung plays a big part in process of food intake and chewing process. Therefore  it is efficiently connected  with the breathing tube. It is even used for rejection of food by spitting things out. But a medical doctor wouldn't know about that when he talks about a poorly designed air intake. Even Dawkins talks nonsense like this. Classic example of professionals believing they know something....when they actually don't. You know we don't eat with gravity alone. ;)