U.S. Vape? You should know even small amounts of liquid nicotine can be extremely hazardous to children and pets who swallow it or come into contact with it through their skin. Liquid Nicotine Used in E Cigarettes Can Kill Children HealthyChildren.org E liquids and vaping products can be dangerous to young children. Vapes can look appealing to little humans, so they should be stored out of reach, similar to poisons and medication. If you What Happens If You Swallow a Zyn? Here's What to Expect