A "Hardcore Vaper" is someone who you don't ever see without their vape and they will use their vape 100% of the time.
Me "Yo, B-Tizzle whats up."
B-Tizzle "puff-puff-puff"
Me "What have you been up to?"
B-Tizzle "puff-puff-puff"
Me "See you later man."
B-Tizzle "puff-puff-puff"
This is a basic example of a Hardcore Vaper.