Can you start vaping straight away?
Can you vape immediately? Yes, technically your electronic cigarette won't self-destruct, but your taste buds might sulk. The taste will likely be bland or very unbalanced. Vaping a freshly mixed DIY is a bit like eating undercooked pasta: it helps in case of famine, but it isn't a memorable experience. If you are truly running on empty, go ahead; otherwise, let the aromas wake up slowly.
Gustatory pleasure is a major barrier against tobacco relapse. A disappointing liquid because you were too hurried could give you a false image of vaping and make you want to smoke again. For sensitive profiles like those with asthma, an unstabilized liquid can also prove to be more stinging. Patience is therefore a health ally. If you cannot wait, turn to mint-based recipes which require very little rest.