Across 7 first-hand reports, people mentioned a side effect 12 times (about 171 per 100 reports). The most common: addiction, restless legs, dry throat. User reports show what people notice — they can't tell you whether Nicotine Vape is safe for you.
“I used to smoke and wanted to quit, switched to vape and became VERY addicted to the vape, like a bloody crack addict, it was depressing.”
“My sleep is literally so bad I think it's affecting my health. My skin is dry. My eyes don't look healthy. Anxious. The dentist said vaping has been making my mouth dry and gum health much worse.”
“vaping, especially in an adolescent, does promote instant gratification - i want to feel different and then immediately i feel different”
“I could easily see that with nicotine gum, with a vape however, it's not as easy but still possible for some. The amount of people I know who created an addiction out of no where with the juul is substantially large.”
Conclusion: Thirdhand nicotine vape residue contributes to changes in some cells in mouse models but not others. Data available to date provide no convincing evidence of likely significant harm to humans. Further investigation is warranted to confirm or deny this impression.