• Check the mouthpiece for cracks or buildup. Soak it in isopropyl alcohol if it's removable.
• Look at the chamber – if you see dark residue, it's time to clean. A cotton swab dipped in alcohol works on most.
• Test the airflow – if it feels tight, there's probably a blockage. Use a paperclip to gently clear the airway.
• Inspect the battery contacts – if they look grimy, wipe with a dry cloth. Poor contact means weak hits.
• Smell the device – if it smells burnt even after cleaning, the coil might be done. Some models have replaceable coils, others don't.