I have had nicotine in a PG base stored for more than 5 years now with great results. Our well respected forum chemist says that nicotine in VG base will hold up better in freezer than in PG base. I think that he has had some stored for around 7 years now. It is thought that it may last indefinitely if stored in the freezer. That was the last that I have read on the subject anyway. This may be helpful to you. kurtnicstorage
I have learned everything that I know about nicotine from Kurt and the above thread should give you the information that you need.
I have learned everything that I know about nicotine from Kurt and the above thread should give you the information that you need.