WHO estimates at least 15 million teenagers use e cigarettes worldwide Reuters Health Problems Caused by Secondhand Smoke Smoking and Tobacco Use CDC 99 Vaping Statistics You Need To Know Some reports state that these new, flavored smoking devices are less harmful than tobacco cigarettes but how safe is vaping? In this third part of a four part series, China Daily examines the Increased e cigarette use prevalence is associated with decreased smoking prevalence among US adults Harm Reduction Journal Springer Nature Link CDC report finds US smoking rate continues to plummet as vape use rises