Most e cigarettes contain nicotine, which is highly addictive. Putting maximum limits on the nicotine strength of e cigarettes, along with evidence based tobacco control strategies, may help reduce youth e cigarette use and increase quitting The FDA's flavored e cigarette guidance could keep adult smokers from safer alternatives Independent evidence review on e cigarettes July August 2023 Current Evidence Identifies Health Risks of E cigarette Use; Long Term Research Needed University of Maryland School of Medicine A analysis of more than 100 studies found the vaping can have long term health consequences.