Hmm. I've never had nic that's been stored properly "go off" on me.
Back in in the second half of 2015 I did leave about 160ml of left-overs from the
blind test sitting around at room temperature for several months and noticed all of it got noticeably darker and smellier. The NN that came in a glass bottle changed the least; the others were all in plastic. I did end up mixing it all down, but even at 15mg, the color was still apparent and the taste was definitely off. I vaped it anyway, but I didn't care for it much, and I was real happy when it was finally gone and it was time to make a new batch from base that had been kept in the freezer.
That experience, along with the fact that I'd already accumulated enough nic to last the rest of my life provided a good bit of the motivation for starting this thread.
How were you handling your nic? Was it in and out of the freezer and being opened and closed as you were using it? What are the steps that can be taken to reduce spoilage?
My entire supply is in 120ml glass bottles that are never opened until I need a new batch of vaping-strength base.