Mild form of CVA here (only needed an inhaler for about three years until we got things figured out.) I do two things in cold weather that help. The first is a face mask through which I breathe. When I exhale it catches moisture and adds it to the air when I inhale. On really long and cold rides I take an extra mask to use when the first one freezes. The second thing I do, it immediately hit a hot shower when returning home and spend at least 30 in the shower. I know it uses a lot of water, but it has made a difference.