expired juice

Nothing most likely. The only possible thing I can think of would be it tastes nasty because the flavoring has gone bad. Or maybe the nic level would be less than what is printed on the bottle because nic can degrade with heat and light.

 

I am vaping some juice that I have had over a year. Only one had a nasty taste. All the rest have been fine. The one that tasted bad also had a not so good odor. If you have old/expired juice, I would smell them before you vape. If it smells ok, it should be fine. I can't say anything about the nicotine degrading, but I vape different strengths. When I have a lower mg, I just seem to vape more often.

 

When I returned to vaping, nearly a year ago now, I had some juice left over from nearly two years before that. It smelled OK, but I pitched it anyway, because I just wasn't feeling sure about what may have occurred or grown in there during that time. A year may be OK, but I'm just kinda squimish if my juice is that old.