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Sweet vape juice can shorten coil life because some sweetening ingredients leave residue on the heating surface. Each heating cycle adds another thin layer until the coil tastes dark, muddy, or burnt.
This is different from a dry hit. The wick may remain saturated while the metal beneath it is heavily coated.
That buildup is cumulative with every refill.
The flavor usually fades gradually
A dry wick can produce a sudden sharp burn. Sweetener buildup tends to arrive more slowly. Bright notes disappear, the liquid tastes increasingly cooked, and the cotton around the coil darkens.
Changing to another flavor in the same coil rarely removes that underlying taste.
More heat speeds the problem
High wattage and long puffs expose the liquid to more heat. Stay within the printed range and stop increasing power when flavor stops improving. Raising wattage to force performance from a dirty coil often makes the result worse.
Cleaning has limits
Rinsing a stock coil may remove loose liquid but cannot reliably remove baked residue trapped around cotton and metal. Dry-burning a cotton-filled coil can scorch the wick. Replace it when flavor remains dirty after the tank is cleaned.
Cleaning the tank before installing that replacement prevents old residue from immediately muddying the fresh coil's flavor.
Run a controlled comparison
If coils fail unusually quickly, install a properly primed replacement and use a less sweet liquid for its entire life. Keep wattage and puff habits the same. A clear improvement points toward the previous liquid rather than defective hardware.
Choose ownership cost consciously
There is nothing inherently wrong with preferring a sweet liquid. The tradeoff may be more frequent coil replacement. Check replacement availability and pack price when selecting hardware if sweet profiles are your normal choice.
For other failure causes, read why vape coils burn out fast.