i am starting to gather it loses potency, but won't actually poison you. I'm not sure if this also counts for non nic plain VG/PG though. I keep reading here, 2 years on those roughly in ideal conditions.. i wonder if plain PG and VG should be frozen as well? It really is all a bit confusing in some ways isn't it? !I'm still unclear on how long nic will last in a dark, cool environment (not frozen)...?