Teens who vape higher doses of nicotine are more likely to become regular smokers USC Today TPCB: E Cigarettes Nicotine absorption from electronic cigarette use: comparison between first and new generation devices Scientific Reports E cigarette market surges amid urgent need for comprehensive regulation and enforcement MAXUS Launches STAR 50K: Built in the USA, Filled with US Made E Liquid Vaping360 Scientific review finds e cigarettes likely cause lung and oral cancer Los Angeles Times