Nicotine, generally found in tobacco cigarettes, is often the assumed substance of vaping. A recent study by Ruoyan Sun, assistant professor at the University of Alabama at Birmingham’s School of Public Health, shows that 35 percent of 12- to 14-year-olds, 51.3 percent of 15- to 17- year-olds and 54.6 percent of 18- to 24-year-olds reported the use of cannabis while vaping.