I just noticed my remaining 6 x 20 ml are expired, the sticker say 02/14 - 08/15 so I think that it is. The liquid turn to be darker brown. The taste is more or less no change (menthol flavor, 9mg/ml). I still don't know could I trash or keep.
E-liquid that has gone bad has a rancid, sour taste and smell. It isn't subtle. You'll know it. Oxidizing nicotine will get darker. The taste may be somewhat stronger. Keep it cool to slow down the oxidation if it bothers you.
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