I have taken dd outside into cooler air when she wouldn't stop screaming, just to see if it would "distract" her enough to stop, but it didnt work ad she had reflux (unknown at the time).

And in my opinion, ds would always get croup from cold air.... So I always give him predmix, i couldnt imagine keeping him outside to grt rid of croup!

Eta: I've not noticed any ill effects from giving predmix, such as hyper. Often i would give it to ds just before bed (my preffered time to dose for croup).