Question: how do i know when i need to change my coil?
Answer: Experiencing a "Burnt" Taste in Your Mouth. This is hands down the most common sign that your coil has gone bad. ... 
Your E-Juice Tastes Funky. ... 
Leaky E-Cigarettes. ... 
Hearing Gurgling Sounds. ... 
Poor Vape Production. ... 
You Vape Very Frequently.