If your disposable or rechargeable vape is underperforming, first check the simplest causes: battery charge, airflow blockage, and coil saturation. For disposables, a lack of vapor often means the device is depleted or the airflow is blocked. For rechargeables, a burnt taste usually signals a dry coil or low battery. If nothing fixes it, stop using it immediately and dispose of it properly—don't attempt risky repairs.