E-cigarettes erase progress in reducing teen tobacco use. A marked increase in e-cigarette use among middle and high school students has eliminated the drop in overall tobacco use documented in previous years, the Centers for Disease Control and Prevention recently reported. In 2018, 20.8% of high school students used e-cigarettes, an increase of nearly 80% over the 11.7% noted in 2017, according to data from the 2011 to 2018 annual National Youth Tobacco Survey. The proportion of middle school students using e-cigarettes increased by nearly 50% during this time, while the use of other tobacco products did not change significantly in either group. But when e-cigarette use was combined with the use of any tobacco product, total tobacco product use by high school and middle school students increased by 38.3% and 28.6%, respectively, indicating that e-cigarettes "were the driver of the observed increase in [use of] any tobacco product." To read the report, go to http://dx.doi.org/10.15585/mmwr.mm6806e1.