We'll need waaaaaaaaaaaaaaaay more information than what you've given us for us to help you.
1) What delivery
device are you using? A clearo? A carto
tank? A dripping atomizer? Be as specific as possible.
2) How hard are you drawing on the delivery device? Sucking on it like you're about to die? Is the delivery device low on liquid?
3) If it's a clearo, did you lose your o-ring? Or is the o-ring possibly damaged?
We need more info to help you.