Most pods burn out. A few habits decide how fast.

Put juice in, screw the pod on, let it sit five minutes. The cotton inside the pod soaks up liquid slowly. Hit it before the cotton is saturated and you scorch the dry parts. Once cotton's scorched, it stays scorched. Flavour never quite comes back right. This is what people mean by 'priming.' Fill it, wait, take a couple of light pulls without firing first. Then go normal. Most early pod deaths come from skipping this one step.

Sweeteners caramelize on the coil. The darker, sweeter juices — candy and dessert flavours — leave residue every hit. After a few days the coil's got a brown crust on it and the cotton can't pull clean liquid through the gunk. Tastes burnt before it's actually burnt. Menthols and light fruit flavours don't do this nearly as much. If you're going through a pod every two or three days and you live on cotton candy juice, that's why. Not the pod's fault. The chemistry's just rough on coils.

Take ten pulls in a row without putting the pod down and the coil never gets a chance to cool. Heat builds up. Cotton dries out faster than the wick can re-soak it. Small pod kits get hot quickly because there isn't much metal to absorb the heat. Slower pulls help. So does putting it down for thirty seconds between hits. Doesn't have to be perfect. Just don't sit there cycling pulls back to back for an hour.

Watch the liquid level. When it gets low the wick stops staying soaked. The first dry hit hurts the coil even if you stop right away. One bad dry hit can change the taste of that pod permanently. Don't wait until the pod is empty to refill it. Top it up when it's about a third full. Most people learn this the hard way once and then start refilling early.

This only matters if you have an adjustable kit. Cranking the wattage gives you bigger clouds and also cooks the coil. The pod's recommended range is on the box. Usually a small window like 12 to 16 watts. Pushing past the top end works for a few pulls then chars the wick. If you're getting harsh flavour at high wattage, drop it down a few watts. Stays in the sweet spot, lasts longer.

Burnt taste that won't quit. Flavour gone weak. Liquid in the pod gone dark and cloudy. Gurgling that doesn't clear. Leaking from places it didn't leak before. Any two of those and the pod's at the end. Pod lifespan varies a lot. Some die in three days. Some last two and a half weeks on the same juice and same habits. There's not always a reason. Some pods just fail early.

Keep pods upright when you can. They leak less. Don't leave them in the car in summer, and don't freeze them in a winter glove box. Heat and cold both push liquid around in ways that wreck the seals. Wipe condensation out of the mouthpiece every few days with a tissue. Use the juice the device was built for. Don't run a freebase 6 mg through a tight pod meant for salt nic. And don't wait until a pod tastes nasty to swap it. Replacing one pod a week early is cheaper than finishing a juice bottle through a busted coil.