A friend asked for some advice on how to deal with a respiratory problem. Not knowing the details of the problem or too much of this person's circumstances in life, it's not easy to give advice. Besides I'm a Project Manager with some interest in Kabbalah so that hardly qualifies me as a subject matter expert and certainly not a physician of anything physical or metaphysical.
Chapter Three: Mystical Physiology
The Physiological Systems of the Body
“...The first property, that of the keter, the super-conscious “crown”, corresponds to the respiratory system, the physical conduit through which the spirit of life enters the body.
When God created Adam, He “formed man of the dust of the ground, and breathed into his nostrils the breath of life.”(Genesis 2:7). Thus, we learn that the breath of life comes from God on high, the source of all life. In breathing, we internalize that which is exterior to use; we inhale from that which is above us.
The Hebrew word for “inhaling” (she'ifah) also means “aspiration.” Thus, breathing is an expression of the soul's innate desire to ascend and go beyond its conscious self into the realm of its super-conscious link to God, as experienced in its super-rational faith, pleasure, and will.
Thus, a lack of pleasure and will in life (reflecting a lack of faith in the Divine purpose of life) may well result in dysfunction of the respiratory system. One should attempt to “breathe” into his being newly inspired aspiration to live...”
There's further mention of the lungs made in Supplementary Essays: 1. Right and Left of this same book. If the above quote did not clarify the matter enough then I can send this additional chapter.