Leaks at the connections on an adjustable-airflow vape usually come from loose seals, over-tightening, or residue buildup. First, power it off, disassemble the mouthpiece and airflow ring, and wipe everything dry. Check the O-rings for damage or misalignment, and re-seat them gently. If the leak persists or if any liquid gets inside the battery compartment, stop using the device immediately and contact the manufacturer.