What is Blinker challenge?
Bliknker is when light at the back of the vape starts Blinking. To complete this challenge you need to do only one Blinker, which can be extremely difficult, because of thick smoke that is produced by vape.
The difficulty of Blinker also depends on vape quality and the ingredients of vape. The hardest ones are those that are as potent as it gets 90%+ and have low resistence and high voltage to produce a lot of smoke.
If you really want to test yourself and find your limit try that one. You will be amazed at what filings can you experience after only one hit.