I've read in places now (the handout that came with Wizard Labs' nic, and here:
Pure-Nic) that nic should be long-term stored at around 40 degrees F, NOT frozen. ...? Who is right? How do we know (testing, research)?
(From link above):
"Nicotine solutions should be stored in a dry, cool, dark location that is secured from untrained personnel. Always keep Nicotine solutions out of the reach of children and pets. For long term storage keep Nicotine solutions in a glass container with an airtight lid, and proper labeling. To help prevent oxidation, keep Nicotine solutions away from heat, light, and in contact with as little oxygen as possible. Nicotine solutions may be safely stored at room temperature. Optimal storage temperature is 34-41 degrees Fahrenheit. Nicotine solutions may be safely used for up to 18 months with proper storage."