hmm nano bots got ya
seriously I dont care to try any nano spray we breath enough crap in without needing nano particles, in the hort industry (and no doubt others) there was ton of research done that organisms dont recognise or react the same to a nano particle of a substance as they do to the original substance
p.s. black cumin seed oil might be worth a gander? I take it from time to time If I've got a cold and clears my lungs pretty quick.
Theres "stories" of it helping asthma etc but dunno how much is hype