E-Mail Study using surveys of more than 1.1 million 13-15-year-olds from 140 countries between 1999 and 2018, finds that the prevalence of smoking cigarettes on at least one day during the past 30 days decreased in 80 countries (57%) but was unchanged or increased in 60 countries (43%). However, during the same time period, the prevalence of using other tobacco products, such as chewing tobacco, snuff, dip, cigars, cigarillos, pipe, or electronic cigarettes, levelled off or increased in 81 (59%) of 137 countries with available data. Surveys of more than 530,000 adolescents from 143 countries between 2010 and 2018, finds that 17.9% of boys and 11.5% of girls used any tobacco product on at least one day during the past month.