Okay so, i recently bought the $20 njoy Npro 2n1 from 7-11, my question is as follows.
So towards what i imagined to be the end of my first cartridge i started tasting a different flavor and noticed a different aroma(also was getting more "vapor" which seemed like smoke), this made me nervous, so i took it apart, and noticed there was black burnt piece of the wire/string inside the cotton wrap. has anyone experienced this?
how do you know when to stop using the cartridge?
or was i possibly overheating and this wasn't supposed to happen?
any insight on this would be nice, thanks, i would like to find out whats going on so i dont end up inhaling anything harmful, which would be defeating the purpose.

So towards what i imagined to be the end of my first cartridge i started tasting a different flavor and noticed a different aroma(also was getting more "vapor" which seemed like smoke), this made me nervous, so i took it apart, and noticed there was black burnt piece of the wire/string inside the cotton wrap. has anyone experienced this?
how do you know when to stop using the cartridge?
or was i possibly overheating and this wasn't supposed to happen?
any insight on this would be nice, thanks, i would like to find out whats going on so i dont end up inhaling anything harmful, which would be defeating the purpose.