If you don't plan on using your E-Cigarette oil right away, then the best way to preserve it for longer is to put it in the fridge or even let it freeze. Nonetheless, you need to be aware that if the disposable vape pen oils you need to store are packaged in plastic bottles, then they need to be transferred to glass bottles. Placing the glass bottle of e-cigarette oil along with the glass bottle in a sealable ziplock bag will prevent it from oxidizing.
It is important to note that the bottles must be kept sealed. Cigarette oil contains glycerin, which is a water-absorbent substance. If stored open for a long time, the fragrance will evaporate and the oil will absorb a lot of moisture from the air, so it will deteriorate if it contains more water.