Society for the Study of Addiction Apr 3 2025 A new study has found that young vapers in the United States who begin using e-cigarettes after graduating from secondary/high school are likely to progress rapidly to frequent use. While US youths who start vaping during secondary/high school typically take about three years to progress to frequent use, this newly identified group of young adults who start vaping a bit later, after graduation (mean age = 20 years), tend to reach frequent use in