I have had asthma since my early teens, though it wasn't until my early teens that I was required to get and use an inhaler. At the age of 20, I made a trip back to the UK (Scotland), and I don't recall requiring an inhaler during my stay. After several months there, I moved on to South Africa, traveling extensively from Johannesburg to Cape Town, West Africa, and back to Johannesburg. I do not recall needing to use an inhaler during this time.
Upon returning to New Zealand, I gradually found the need to carry an inhaler at all times. On specific occasions, I had to call for an ambulance, and on another occasion, I felt the onset of an asthma attack, managing to take myself to the hospital. Not long ago, around 10 pm, I had a severe attack and asked my wife to drive me to the nearby hospital. Reflecting on the pieces of the attack, I realized it was due to my late afternoon activity of cutting and mulching up branches of a Eucalyptus tree.
In my opinion, based on my experiences, asthma is a result of an environmental and allergic reaction. I wonder why I haven't heard of a treatment to suppress allergic reactions to certain conditions. Perhaps having an allergy test to determine what I am allergic to, and undoubtedly others, could be a step in the right direction. While it may not be a cure, it could be a "cure" for me. Perhaps I should request an allergy test to find out if I can be asthma-free by taking whatever suppresses all known allergies.