There are several reasons why your vape device may be producing less vapour than normal, including:
Drained battery
This is the most common reason why your vape device is producing less vapour. Replace it with a fully charged battery.
Device needs priming
Before using your vape device, take a few short draws on the mouthpiece. This will soak the wick in e-liquid and allow your vape device to produce vapour to its full capacity.
Poor connection
Remove the pod and check the bottom to ensure that it is dry. Turn it back to front and reinsert.