who invented e cigarettes The untold story of the first E-Cigarette inventor A brief history of e-cigarettes

Partly Competing Interests: No competing interests were disclosed

Smoking pack-years, cigarettes per day and alcohol consumption were self-reported by questionnaire

(That's something that experience bears out, and I usually recommend that new e-cigarette users go one strength above what they use in tobacco cigarettes.) Source : Bullen quoted on E-Cigarette Research Chris Price of ECigarette Politics agrees with, pointing out that professional chemists on ECigaretteForum estimate that only about 50% of the nicotine in e-liquid is actually contained in e-cigarette vapour

Many countries allow travel with vapes, and have similar or identical rules as the U.S