Disposable e-cigarettes, as the most popular type of e-cigarettes among young people, have a variety of flavors, and their growth rate is steeper. More than 90% of disposable e-cigarettes sold had the highest nicotine content, up from 0% in 2017. With the product exempted from U.S. federal restrictions on flavored e-cigarettes in 2020, the popularity of disposable e-cigarettes has skyrocketed, with usage increasing by about 1,000% among high school e-cigarette users between 2019 and 2020.