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Just my two pence worth but: There hasn't been enough study on how e-liquid ages most manufacturers come up with the 2yr date as a generalization by law consumables have to have a best before date on. Most people will tell you if it has a bad odor it has gone off whilst others say to try a small batch, there might be a slight decrease in the potency but nothing really noticeable. If it's just Nicotine (plus carrier) I am using 7.2mg from the freezer which is 10yrs old now without issue.