There are two reasons for storing e-Liquid at a cold temperature: First, reducing the temperature inhibits bacterial growth. While bacteria is unlikely to grow in nicotine containing liquid, you can never be too safe. Second, it is often recommended that nicotine be stored at a low temperature (
see:Chemical Book,
NTP Chemical Repository). Since nicotine is the most unstable element in e-Liquid, it just makes sense to base storage recommendations on those recommended for nicotine. Those are the reasons we recommend 2-8C, tightly sealed & away from light. Others may have other reasons.
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