No loss of strength noticed here with e-liquid stored at room temperature in a closed bottle for 6 weeks....I agree with the general consensus on this thread that the liquid seems to be pretty stable. Though to be a little safer, my spare 30-ml bottle is in the fridge.
As for freezing, I'd think it'd probably work, but obviously you don't want to commit a huge stash to any risk. Maybe a smal-scale experiment would help - try freezing a small amount in a suitably small, sealed container (plastic, not glass, or it might crack). The problem might be getting the container - you could wait till a bottle of e-liquid is nearly empty and just freeze that, or maybe use a contact lens fluid container (wash it out well first). Generally, it's the freeze-thaw cycle that does the damage to most things, rather than the prolonged duration in the cold, though you never know. It'd be interesting to see whether the stuff will freeze at all, using normal domestic freezer temperatures (around -20 degrees centigrade).
One confounding factor could be oxygen - a small amount of liquid in a relatively large container is exposed to a relatively large amount of air, and therefore oxygen, which might conceivably oxidise some ingredients. But you're not going to freeze your main stash in that fashion, you'd be freezing filled bottles which contain a lot less air - so if you can't find a really tiny container for your experiment, then if the experiment shows no degradation, your stash will be safe, but if the experiment shows it goes off, it doesn't really prove anything.
It's probably fine to just store it well-sealed in a cool, dark place, rather than take any risks by sailing into uncharted waters.
Cartridge stability may be another matter - Gamucci recommend consuming within 2 weeks after opening. That might be just to sell more carts, though my own experiences suggest they may well deteriorate. Presumably there's more scope for oxygen to attack the liquid in a cartridge. That applies to the ones you refill yourself as well.
But it's difficult to be sure - somebody's mentioned that the brain can adjust to the flavour of your favourite e-liquid over time, and make it seem like your stash is losing its strength. And rather like cigarettes, I find the first one of the day can taste stronger than after I've had a few. I'm seriously considering abstinence just to heighten the pleasure when I start again.
How was I supposed to shoot down evil Cylons hell bent on wiping out human life with a glued-in missile?
