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 No scientific evidence that E Cigarettes are less harmful: Health Experts, ETHealthworld E cigarettes: Mounting evidence shows the dangers of these new age devices School of Public Health That big claim that vaping leads to smoking may be based on insubstantial evidence Public Health Consequences of E Cigarettes