Nicotine delivery different for different e cigarettes finds study E Cigarettes, Vapes, and other Electronic Nicotine Delivery Systems (ENDS) FDA E cigarette taxes reduce vaping without increasing adult smoking, new study finds 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 E cigarettes