Before you get into a rhythm, give your device a quick once-over. Look at the mouthpiece, the sides, and the bottom. If you see any sticky residue or drops of liquid, wipe it off with a dry cloth. Leaks can happen when a device is stored at extreme temperatures or left on its side for a long time. If you notice cracks in the plastic, or if the device feels sticky even after cleaning, it's safer to stop using it and grab a new one.

Also, check the airflow holes. Dust and lint can collect there, blocking airflow and making your hits feel tight. A quick blow through the mouthpiece usually clears it.