Why is acupuncture good for asthma and allergy?

In TCM, the lungs control the hair and skin. If the lungs are strong enough, the skin can protect us from the attack of the exterior pathologic factors. It is just because our body is not strong enough, the cold, the allergic factors can get us. Plus, the urinary bladder is the biggest channel. It is also important for asthma and allergy. And the other organ’s stronger function is important too. Acupuncture can make these skin, channels, and organs strong. And then asthma and allergy can be cured. Of course, not all asthma and allergy could be cured by acupuncture. Such as asthma due to heart disease; allergy due to some drugs, etc.