FUM Zero- Single Use Device - AssortedFUM Zero Single Use Device Assorted FM Zero is our bold new single use flavored air device designed for accessibility, simplicity, convenience, and a fresh start. It delivers FMs signature plant powered flavor in a compact, ready to use device. Just breathe in and enjoy, no refills, no recharging, no setup. How do I use FM Zero? Its easy! Just pop off the cap, set the airflow to your favorite spot, either mid or fully open, then breathe in and enjoy