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A burnt taste almost always means the cotton wick inside your coil has dried out and is being scorched by the heating element. This usually happens when too little e-liquid is reaching the coil, when a new coil hasn't had time to soak, or when you're chain vaping faster than the wick can re-saturate.
MTL (mouth-to-lung) means drawing vapour into your mouth first, then inhaling it into your lungs, similar to smoking a cigarette. DTL (direct-to-lung) means pulling vapour straight into your lungs in one motion, similar to a deep breath. MTL kits use tighter airflow and higher-resistance coils; DTL kits use looser airflow and sub-ohm coils.
There's no fixed number of days that suits everyone. As a broad guide, many vapers find a coil lasts roughly one to two weeks of regular use, though sweeter e-liquids and heavy use can shorten that considerably. The clearest signal isn't the calendar, it's the taste: once flavour turns muted, harsh or faintly burnt, the coil needs replacing.
Terms worth knowing
Full glossary →Coil
The replaceable part inside a tank or pod that contains a length of resistance wire wrapped around (or through) a cotton wick. It heats the e-liquid to produce vapour and wears out over time.
DTL (direct-to-lung)
A vaping style where vapour is pulled straight into the lungs in one motion, similar to a deep breath. Typically used with sub-ohm coils, looser airflow and higher-VG e-liquid.
Dry hit
An unpleasant, scorched-tasting puff caused by the wick not having enough e-liquid on it when the coil fires. A sign to check e-liquid level, priming, or coil age.
MTL (mouth-to-lung)
A vaping style where vapour is drawn into the mouth first, then inhaled into the lungs, similar to smoking a cigarette. Typically used with higher-resistance coils and tighter airflow.
Nic salt
A form of nicotine (nicotine salt) that's smoother on the throat at higher strengths than freebase nicotine, which is why nic salt e-liquids are popular in the lower-power pod kits many ex-smokers start with.
Sub-ohm
A coil with resistance below 1.0 ohm. Sub-ohm coils need more power and higher-VG e-liquid, and are generally paired with DTL, looser-airflow devices rather than tight MTL pod kits.