Though I am skeptical myself, it's much different than other many other hokum/pseudoscience in that it is probably not very harmful and no one tries to sell you

Though I am skeptical myself, it's much different than other many other hokum/pseudoscience in that it is probably not very harmful and no one tries to sell you something. Quick google searches show that there are in fact studies that show that different breathing techniques do help with anxiety. The article itself links some.