Hello everyone, I have a question about the liquids. Do they have a expiration date? Also, I have a bottle of cheesecake flavor, that used to be red, but I looked at it today and it's now a dark brown? Has that happened to any of you? Is it still safe? I haven't used it in a while because I lost the charger for my Janty ego. It smells the same, I was planning to use it in the Volt I just ordered, but now i'm worried.