Busted.

Anyhow, this is a big problem for me too. Once it hits 40F, going cold->warm induces fits of coughing. Wearing my neck gaitor (really a cut off stocking cap) over my mouth helps tremendously. It helps to capture some of the heat I exhale to warm the incoming air and also adds some moisture to the dry air. I'm fine when I'm out in the cold and I really prefer to have nothing over my mouth, but even more I prefer to be able to breathe and speak once I'm indoors.