Nicotine use among young people is evolving. New research shows more youth are using multiple nicotine products at the same timemost commonly cigarettes and e cigarettes, with a growing rise in combining vapes Systematic Review and Critical Analysis of Longitudinal Studies Assessing Effect of E Cigarettes on Cigarette Initiation among Adolescent Never Smokers E cigarettes 'Potentially as Harmful as Tobacco Cigarettes' UConn Today Study shows vapes emit more lead than 20 packs of cigarettes yes, *20.* New research has uncovered a disturbing truth about popular disposable vapes: they may be more toxic than New E Cigarette Laws Could Drive Some Users to Smoke More Cigarettes Duke Health Scientists Wanted: Recruited by Juul, Many Researchers Say No The New York Times