Well I'd advise to keep your pie hole shut but the asthma thing...
If I'm in a buggy area I use a bit of an overbite look to breathe without inhaling bugs...usually works fine.
Where the heck are you riding where it's that buggy?
I'm in Northern NY in dairy country with hay and cornfields everywhere as well as Lake Ontario and the St. Lawrence just down the road but I generally get schmaybe one buy per season.