btw Guan Yin is a Bodhisattva(Pusa) of Infinity great
Compassion, rather than a God.
from the medical side of Buddhism, below are some cause related
illness to our 5 precepts:
Killing cause liver & eyes illness.
Intoxication cause heart & mouth illness.
Lust cause kidney & ear illness.
Unwholesome Speech cause spleen & tougue illness.
Stealing cause lung & nose illness.
Also if disturb other cultivate spiritual mediataion or praying,
cause craziness. --- Mo He Zhi Guan
http://bookgb.bfnn.org/books/0617.htm#a04
May try asking the person to observe non-stealling next time.
You cure the mind, you cure the body. no need to eat croc
meat.
Another harder way is help other ppl with asthma, more you help
others, the more you cure yourself.
it's simply cause and effect. 
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