Comfrey Symphytum was used as a herbal remedy for centuries for many ailments.
A friend who had suffered asthma for over 20 years had brought this to my attention.
I ask him why does he grow so much Comfrey in his veg. garden his reply was a surprise. “I eat a raw leaf, now and then since doing so haven’t had any troubles with asthma. l can sleep all night with none of the old wheezing”. Upon researching comfrey this has been recorded many times. Has any of you tried this?

Genesis - Bronchial Treatment

UPDATED : How I Cured my Asthma Naturally