When e-liquid goes bad or expires, its quality and flavor can deteriorate. Here are some common changes and potential issues that may occur when e-liquid goes bad: Flavor Loss Changes in Color and Consistency Altered Aroma Harshness or Throat Irritation Nicotine Potency Even though expired e-liquids may not provide the best vaping experience, they generally don't pose significant health risks. We still do not advise using expired juice. If the e-liquid appears spoiled, has an off-putting odor, or experiences any adverse effects when vaping it, it's best to discard it and replace it with fresh e-liquid.