I am a victim of asthma ever since 1994 and have tried all sorts of drugs to combat it with absolutely no effect. What actually is effective for me is preventing the bacteria form food particles from getting in touch with the nerves of my upper lip. Whenever I experience some kind of breathlessness, I slowly wipe clean the upper corner of my lips with a tissue and this is very effective in reducing my breathlessness. I have conducted a lot of study about this in detail, but have not been able to come up with anything. I think that the nerves on my upper lips are open to bacteria and if I really do not keep my lips clean, I will certainly choke to death. So the only solution is to steer clear of any spicy food like pepper and also food that does not really liquefy and to use a brush and wash clean all the bacteria every day. So the next time you start feeling breathless, try licking or rubbing your lip clean and it may work out for you. I find that this is the only thing that has been effective for me since fifteen years.