Knowing what you're smoking is VERY IMPORTANT. There have been cases where people smoke fake cartages they get off of friends or the street that've lead to serious health problems. Spotting a fake cartridge can be tricky, but for your own health, you should know how to spot one. The quickest way to know is if it has a serial code. Brand websites have a way for you to check your code to see if it's fake or not. Packaging and looks are easy to fake so don't be fooled. Do your research and know where you're getting your product from.